JPH0136228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a color fluorescent display tube and its scanning method.

Conventionally, cathode ray tubes have been used to display images, but in recent years there has been a desire for the development of color fluorescent display tubes that can be constructed thinly as wall-mounted and portable displays.

FIG. 1 is an electrode arrangement diagram showing an example of a conventional color fluorescent display tube. In the figure, 1 ₁ to 1 m are grids arranged at equal distances from each other, and 2 ₁ , 3 ₁ , 4 ₁ to 2n, 3n, and 4n are orthogonal to grid 1 and are arranged at a predetermined distance apart. It is an anode provided as 2 ₁ , 3 ₁ , 4 ₁ .
One anode group 5 is composed of two anodes. The anode 2 ₁ that intersects with the grids 1 ₁ to 1 m is coated with a blue-emitting phosphor 6B at the intersection, and similarly the anode 3 ₁
is coated with phosphors 6G and 6R that emit green light, anode 4 ₁ is coated with red light emitting phosphors, and the remaining anodes 2 ₂ -
Similarly, all 4n are coated with phosphors that emit blue, green, and red light.

In the conventional color fluorescent display tube constructed as described above, the phosphor 6 is located at the intersection of the anode group 5 and the grid 1.
is the smallest light emitting unit, and the grid 1 and anode group 5 are scanned to display an image.

However, in order to ensure resolution in such a fluorescent display tube, each phosphor is made very small, so the width of the grid 1 is also very narrow. For this reason, the area of the grid 1 becomes narrower, and the amount of electrons reaching the anode group 5 decreases, resulting in a drawback that satisfactory brightness cannot be obtained.

In order to eliminate this drawback, a method has been proposed in which two dots of each color of phosphor are placed on one grid, but in this case the number of external leader lines increases significantly, making it impractical. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a color fluorescent display tube and a method for driving the same, in which sufficient brightness can be obtained even if the phosphor is configured to be small in order to ensure resolution.

In order to achieve such an object, the fluorescent display tube according to the present invention divides the grid into a plurality of scanyan grids and a matrix grid that partially overlaps the scanyan grids, and the scanyan grids are individually pulled out to the outside, and the matrix grid is Every other grid is commonly connected and drawn out as two lead lines. Then, an image signal is supplied to the anode group to scan the anode group, and when the image signal is supplied, a voltage is always supplied to the scanning grid for two adjacent sheets as a unit, and a voltage of opposite polarity is applied to the matrix grid. , and each time one scanning line of all the anodes is completed, the voltage supplied to the scanned grid is applied to one of the two scanned grids and one scanned grid adjacent to the scanned grid. A scanning method is applied in which the polarity of the voltage supplied to the matrix grid is reversed every time one scanning line is completed for all the anode groups. The present invention will be explained in detail below using the drawings.

2 and 3 are electrode arrangement diagrams showing one embodiment of the present invention, in which FIG. 2 is a view seen from the front;
FIG. 3 is a sectional view taken along the line A-A' in FIG. 2, and the same symbols are used for the same parts and corresponding parts as in FIG. 1.

In the figure, matrix grids 7 ₁ to 7n are arranged so that their longitudinal sides are adjacent to each other, and the flat portions are placed opposite each other at an equal distance from one surface of the matrix grids 7 ₁ to 7n. Scanning grids 8 ₁ to 8n are arranged. and,
The matrix grids 7 ₁ to 7n and the scanned grids 8 ₁ to 8n are arranged so as to overlap each other by half in the short side direction. Also, a plurality of anodes 2 ₁ , 3 ₁ , 4 ₁ , -2n, which face the other surface of the matrix grids 7 ₁ -7n and are spaced from the matrix grids 7 ₁ -7n at an equal distance and are perpendicular to each other,
3n and 4n are arranged, and this anode 2 ₁
4n constitutes one anode group 5 every three. Each anode group 5 has phosphors that emit green, red, and blue light, which are regularly arranged for each width in the short side direction of the matrix grids 7 ₁ to 7n, and each phosphor has the same emission color. connected to the same anode.

Among the electrodes arranged in this way, the scanyan grids 8 ₁ to 8n are individually drawn out to the outside, and every other matrix grid 7 ₁ to 7n are commonly connected to form matrix grid groups 9a and 9b, Pull out the two leader wires to the outside and connect the anode 2 ₁
~4n are individually drawn out.

The operation of the fluorescent display tube according to the present invention configured as described above is as follows. First, a positive voltage is supplied to the matrix grid group 9a, and a negative voltage is supplied to the matrix grid group 9b. Then, for example, a positive voltage is supplied to the scanyan grids 8 ₃ and 8 ₄ that overlap the matrix grid 7 ₃ , a negative voltage is supplied to the other scanyan grids, and a positive voltage is supplied to one set of the anode group 5.

As a result, among the intersections between the anode group 5 and the matrix grid ₇₃ to which a positive voltage is supplied, only the phosphors in the range where a positive voltage is supplied to both the matrix grid and the scanned grid are It emits green, red, and blue light. Therefore, when the voltage is supplied, the phosphor facing the matrix grid ₇₃ emits light.

Next, a negative voltage is applied to the matrix grid group 9a, and a positive voltage is applied to the matrix grid group 9b. Then, a positive voltage is supplied to the scanyan grids ₈₄ and ₈₅ which overlap the matrix grid ₇₄ , a negative voltage is supplied to the other scanyan grids, and a positive voltage is supplied to the same anode group 5 as described above.

As a result, only the portion of the phosphor facing the matrix grid ₇₄ emits green, red, and blue light.

In this way, the skiyan grids 8 ₁ to 8n supply a positive voltage to two adjacent grids as a set, and the combination of supplying this voltage is sequentially transferred to the adjacent skiyan grids one by one, and in synchronization with this transfer. By alternately supplying voltages of opposite polarity to the matrix grid groups 9a and 9b, the light-emitting portion of the phosphor 6 sequentially moves in the voltage movement direction of the scanning grids ₈₁ to 8n.

In this case, since positive voltage is always supplied to two skiyan grids 8 ₁ to 8n at the same time,
The area of the grid is doubled, more electrons can be supplied to the anode group 5, and sufficient brightness can be obtained. For this purpose, matrix grid groups 9a and 9b are also provided.
There are only two additional leader lines.

Note that the phosphors 6B, 6G, and 6R have blue, blue, and blue phosphors in the short side direction of the matrix grids 7 ₁ to 7n, as shown in FIG.
How to line up the three colors of green and red so that they emit light,
There is a method of arranging the matrix grids 7 ₁ to 7n in the longitudinal direction as shown in FIG. The arrangement shown in Fig. 4 improves the resolution in the short side direction of the matrix grids ₇₁ to 7n, and the arrangement shown in Fig. 5 improves the resolution in the longitudinal direction of the matrix grids ₇₁ to 7n, depending on the application. You just have to use it properly. Also,
The arrangement of each color only needs to be regular, and there is no need for specific colors to be arranged at specific positions.

The scanning method of the fluorescent display tube according to the present invention configured as described above is as follows. Figures 2 and 3
In the fluorescent display tube having the structure shown in the figure, a positive voltage is applied to any two adjacent scany grids 8 ₁ to 8n, and voltages of opposite polarity are applied to matrix grid groups 9a and 9b. If a positive voltage is supplied to the anode group 5 in this state, the phosphors in the portions of the anode group 5 to which the positive voltage is applied to both the scanyan grid and the matrix grid will emit light. Then, by sequentially transferring the positive voltage supplied to the anode group 5 to the adjacent anode groups 5, one scanning line is displayed. After displaying one scanning line, the voltage supplied to the scanned grid is transferred to the adjacent scanned grid in the manner described above, and the polarity of the voltage supplied to the matrix grid groups 9a and 9b is changed accordingly. Invert. In this state, if a positive voltage is again supplied to the anode group 5 and this positive voltage is transferred to the adjacent anode groups one after another, the second scanning line can be displayed, and by repeating this operation, the second scanning line can be displayed. rasters can be displayed. In this case, if the voltage supplied to the anode group 5 is an image signal, an image can be displayed on the raster.

In this way, the anode group 5 that supplied the image signal
By scanning sequentially, selecting scan grids 8 ₁ to 8n that supply voltages corresponding to this scanning, and reversing the voltages supplied to matrix grid groups 9a and 9b, images can be created by point-sequential scanning. Can be displayed.

FIG. 6 is a block diagram for explaining a scanning method using the line sequential method, for example when displaying a television image. In the same figure, 10
Reference numerals a and 10b are image signal storage circuits, each of which stores image signal information for one scanning line and outputs it as an analog image signal having luminance information and color information. 11 is an image signal storage circuit 10
This is an anode driver for supplying the image signals output from a and 10b to the anode group 5 of the fluorescent display tube 12. Reference numerals 13 and 14 denote a scann grid driver and a matrix grid driver that supply the voltages described above to the scanned grids 8 ₁ to 8n of the fluorescent display tube 12 and the matrix grid groups 9a and 9b in synchronization with the horizontal deflection signal of the television. It is.

In the scanning circuit configured in this manner, the image signal storage circuit 10a stores image signal information corresponding to the first scanning line from an external device (not shown). Next, the image signal storage circuit 10b stores image signal information corresponding to the second scanning line, and at this time,
The image signal storage circuit 10a supplies the previously stored image signal information corresponding to the first scanning line as an analog image signal to all the anode groups 5 of the fluorescent display tube 12 via the anode driver 11 at once. The scanned grid driver 13 and the matrix grid driver 14 drive the scanned grids 8 ₁ to 8 so that the first scanning line emits light.
2 of n and matrix grid groups 9a and 9
Supply voltage to b. Then, the image signal information corresponding to the third scanning line is stored in the image signal storage circuit 10a.
The image signal storage circuit 10b supplies the image signal corresponding to the second scanning line to all the anode groups 5 of the fluorescent display tube 12 at once via the anode driver 11. At this time, voltages are supplied to the scanned grids 8 ₁ to 8n and the matrix grid groups 9a and 9b from the scanned grid driver 13 and the matrix grid driver 14 so that the second scanning line emits light.

In this case, image signal storage circuits 10a and 10
If the switching of the image signal from B and the operation of the scanning grid driver 13 and the matrix grid driver 14 in synchronization with this are performed in accordance with the period of the horizontal synchronizing signal of the television signal, the television signal will be switched line sequentially. can be displayed. and green,
Depending on the amount of red and blue light emitted, it is possible to perform not only color display but also black and white display.

As explained above, in the color fluorescent display tube and the scanning method thereof according to the present invention, the grid is composed of a plurality of scany grids and a matrix grid arranged partially overlapping the scany grids, and the scany grids are individually drawn out to the outside. , the matrix grid has a structure in which every other wire is connected in common and two lead wires are drawn out to the outside, and the scanned grid sequentially transfers voltage to the adjacent parts, and the matrix grid transfers the voltage to the adjacent part. Conventionally, the amount of electrons reaching the anode group 5 is small because a scanning method is applied in which the polarity of the supplied voltage is synchronously reversed and image signals are supplied to the anodes point-sequentially or line-sequentially. This has an excellent effect in that it is possible to construct a high-luminance fluorescent display tube in which a large amount of electrons reach the anode group 5, even though it was possible to configure only a low-luminance fluorescent display tube.

[Brief explanation of drawings]

Fig. 1 is an electrode arrangement diagram showing an example of a conventional color fluorescent display tube, Figs. 2 and 3 are electrode arrangement diagrams showing an embodiment of the present invention, and Figs. 4 and 5 are phosphor arrangement diagrams. 6 are block diagrams for explaining the scanning method according to the present invention. 1... Grid, 2 ₁ ~ 4n... Anode, 5
... Anode group, 6 ... Phosphor, 7 ₁ to 7n ...
Matrix grid, 8 ₁ to 8n... skiyan grid, 9a, 9b... matrix grid group,
10a, 10b...image signal storage circuit, 11...
Anode driver, 12... Fluorescent display tube, 13...
... Scanning grid driver, 14... Matrix grid driver.

Claims (1)

[Scope of Claims] 1. A plurality of matrix grids, a plurality of skiyan grids arranged so as to face one side of the matrix grid and have an overlapping part, and a position facing the other side of the matrix grid. A color fluorescent substance characterized by comprising a plurality of anodes disposed in the anode, and phosphors that emit green, red, and blue light and are regularly connected to each anode group constituted by three anodes. display tube. 2. The color fluorescent display tube according to claim 1, wherein the overlapping areas of the matrix grid and the scanyan grid are each half of each other. 3. A plurality of matrix grids, a plurality of skiyan grids arranged so as to face one surface of the matrix grid and have an overlapping part, and a plurality of skiyan grids arranged at a position facing the other surface of the matrix grid. In a color fluorescent display tube composed of an anode, and phosphors that emit green, red, and blue light, each of which is regularly connected to an anode group consisting of three anodes, the anode group receives an image signal. A voltage is supplied to two adjacent scanned grids, and voltages of opposite polarity are supplied to adjacent parts of the matrix grid to scan the anode group for one scanning line of all the anodes. Every time a scan is completed, the voltage supplied to the scanned grid is transferred to one of the two scanned grids and one scanned grid adjacent to the scanned grid, and the voltage supplied to the matrix grid is completely reduced. A scanning method for a color fluorescent display tube, characterized in that the polarity is reversed every time one scanning line of scanning for an anode group is completed. 4. The method of scanning a color fluorescent display tube according to claim 3, wherein the scanning of the anode group is point-sequential scanning. 5. The method of scanning a color fluorescent display tube according to claim 3, wherein the scanning of the anode group is line sequential scanning.