JPS5822757B2 - Eizohiyoujisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an X-
The present invention relates to a video display device using a Y matrix display panel.

A block diagram of a conventional X-Y matrix display panel is shown in FIG.

In Figure 1, the X thin electrode is X□. X2. ...Xi・
..., Y thin electrodes Y, , Y2. . . .Yj... indicates, and Pij indicates a light emitting element point.

When performing television display using such an X-Y matrix display panel, the number of resolution lines that can be displayed is determined by the number of electrodes. For example, in the NTSC system, the number of X-fine electrodes is approximately 640 for a black and white image, The number of Y thin electrodes is approximately 48
Therefore, the pitch between the light emitting element points, that is, the electrode pitch must be made very small.

Fig. 2 is an enlarged view of Fig. 1, and for the purpose of displaying a color image, phosphors for R, G, and B are placed at the light emitting element point P1□s ”2.
1 j It was applied to P31.

In this case, the pitch between the light emitting element points when displaying a color image is a, and the pitch when displaying a monochrome image is b.

Therefore, when considered as a color television receiver, the number of electrodes is three times the 640, and for example, in a panel with a diagonal length of 20 inches (50.8 cIrL), the pitch is 0.2 m, rn.

Furthermore, the pitch becomes smaller for smaller inch panels.

Making a display panel with such a small pitch is extremely difficult considering the area of the phosphor and the electrode line width.On the other hand, even if a display panel could be made, the display panel drive circuit would have to correspond to each electrode. individual drive stages are required, making the connection process very difficult.

Therefore, an object of the present invention is to provide a video display device that is easy to manufacture and whose drive circuit can be simplified.

FIG. 3 shows a configuration diagram of an example of a matrix display panel used in the present invention.

In the figure, electrode X1. X2...X2□...and electrode ¥1. ¥2. ...￥2. . . . are the same electrodes as shown in FIG. 1, and Pl, .

P"2□ and P"31 indicate R, G, and B light emitting phosphors, respectively.

The arrangement of light-emitting element points is as shown in Figure 3, in a set of R, G, B.
In this case, there are two X electrodes and three X electrodes.
A book is used to excite the phosphors arranged in the order of R, G, and H, and a set of six X electrodes is constructed so as to be arranged repeatedly along the X electrodes.

That is, unlike the light-emitting element points constituted by general XY matrix electrodes, the structure is such that the light-emitting element points are arranged every other one.

In order to enable such arrangement of light-emitting element points, for example in a gas discharge panel, holes 4-2 constituting cells are formed in an intermediate sheet 4-1 as shown in FIG. A fluorescent substance 4-4 may be applied to the front glass 4-3.

Now, in FIG. 3, the pitch of the light emitting element points is e as shown in the figure, and the pitch when displaying a monochrome image is f.

Considering that the pitch of conventional light-emitting element points is determined by the electrode line width and phosphor width, with this configuration it is possible to obtain the relationship e < a with the same electrode line width and phosphor width as above. becomes.

That is, f<b can be satisfied. On the other hand, Y thin electrode
1. The pitch of ¥2... becomes h as shown in FIG. 3 when a black and white image is displayed.

That is, compared to the conventional display panel (Fig. 2), h>
c, and the resolution in the Y-axis direction (vertical resolution when displaying a commonly used television signal) decreases.

However, considering that different signals are applied to each of the X electrodes, it becomes possible to display each scanning line with each X electrode.

Therefore, the pitch of the X electrodes is g shown in Figure 3,
Since it is possible to set g=e, display can be performed without reducing the resolution in the Y-axis direction.

Next, 1 line at a
The driving method using the time method will be explained.

For a display panel having light-emitting element points having the configuration shown in FIG. 3, it is sufficient to cause light to be emitted from one X electrode by a signal applied to every other X electrode.

In other words, even if signals are simultaneously applied to two adjacent X electrodes, the light emitting element point will be determined by the corresponding selected X electrode.

Therefore, for example, the X electrode X1. X2 is connected to form a common electrode X1, 2, and R-G-R-G.
It is sufficient to apply a composite color signal of...

FIG. 5 shows a color signal synthesis circuit, and FIG. 6 shows its waveform diagram.

Assuming that the combined color signals are ERG and EBR5EGB,
These are the common electrode x 1.2 of each panel in Figure 3.
This is a signal to be applied to each X electrode of jX3, 41 x5, 6.

Therefore, by sampling each of these EAO tEBR and EGB signals, storing them in memory, and simultaneously applying them to the X electrode of the display panel, it becomes possible to display an image.

FIG. 7 shows the phase relationship during sampling.

51RG x 5tBRt 5tGB s 52RG indicates a sampling pulse corresponding to each common electrode (Xl, 2.X3, 4...), and T shown in the IH off period diagram of the signal
H period), the sampling pulse position is shifted by the sampling pulse width Ts.

Furthermore, one common electrode Xi, i+. The sampling pulse for this has repetitions of TH+TS and T'HTs as shown in the figure.

By doing so, a sampling pulse having a phase corresponding to the position of each X electrode can be obtained.

An example of a circuit for generating this sampling pulse is shown in the eighth section.
As shown in the figure.

In FIG. 8, 8-1 is a gate signal input terminal synchronized with a horizontal synchronizing signal, 8-2 is a synchronous oscillator, and the oscillation frequency is determined depending on the number of X thin electrodes.

8-3 is a binary count, 8-4 is a vertical synchronization signal input terminal, 8-5 is a flip-flop, 8-6 and 8-7 are N
An AND circuit, 8-8 a NOR circuit, 8-9 a shift register, 8-10 a sampling pulse output terminal,
Indicates that every other stage of the shift register is taken out.

In operation, the output of the oscillator 8-2 is counted by the counter 8-3, the first and second pulses are taken out, and these pulses are inputted with a signal reset by the vertical synchronizing signal and synchronized with the horizontal synchronizing signal. NAND circuit 8-6.8-7 by output Q, Q of flip-flop 8L5.
The shift register 8-10 is started by the output signal of the NAND circuit 8-6, 8-7.

Therefore, at any output end of the shift register 8-10, a pulse with a pulse width Ts is sent to an arbitrary output terminal of the horizontal synchronizing signal TH+.
It is obtained with a repetition period of Ts, TH-'l'3.

A block diagram summarizing the above configuration is shown in FIG.

That is, FIG. 9 is a block diagram of one embodiment of the video display device of the present invention.

In FIG. 9, terminals 9-1, 9-2 indicate synchronization signal input terminals, and terminals 9-3, 9-4 and L-5 indicate R, G, B
Shows the color signal input terminal.

9-6 is the switching circuit shown in FIG. 5, and 9-7 is the switching circuit shown in FIG.
This is the sampling pulse generation circuit shown in the figure.

9-8 is a sampling/hold circuit, and 9-9 is a pulse width modulation circuit, which modulates the sampled level into a pulse width using the sawtooth wave signal 9-10.

9-11 shows an amplifier circuit.

Reference numeral 9-12 is an X-electrode drive circuit formed of, for example, a shift register.

With this configuration, it is possible to apply an input signal to each scanning line, that is, to each IY electrode, and display the image.

Naturally, a scanning signal is applied to the X electrode in the order of Yl, Y2, . . . for each IH.

The above has described the display of color television signals, but if the purpose is to display black and white television signals, apply a phosphor that becomes white as shown in Figure 3, and change the position of the sampling pulse as shown in Figure 7. If the video signal is sampled as shown in FIG.

In this case, the switching circuit shown in FIG. 5 is not required.

The above enables monochromatic television signal display.

FIG. 10 shows another example of a matrix display panel that can be used in the present invention.

X electrodes X1, 2y X3, 4...: and Y electrodes Y0. ¥2. ... is Xl, 2°X3, shown in Figure 3.
4... and Yl, Y2. ...is the same as...

That is, the X electrode in FIG. 10 is bent as shown in the figure, and such an electrode can usually be made by vapor deposition.

Incidentally, the phosphor may be arranged at the intersection of these X and X electrodes in the same manner as the phosphor arrangement shown in FIG.

As described above, according to the video display device of the present invention, the display panel drive circuit can be halved compared to the conventional one without reducing the number of pixels in the horizontal direction, and the number of connection lines between the display panel and the drive circuit can also be reduced. can be used to reduce costs.

Furthermore, since it is possible to reduce the pitch between the light emitting elements of the display panel, high quality video display can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an electrode layout diagram of a conventional X-Y matrix display panel, FIG. 2 is an enlarged view of FIG. 1, and FIG. 3 is a configuration diagram of an example of a matrix display panel that can be used in the present invention.
FIG. 4 is an exploded perspective view of the display panel, FIG. 5 is a circuit diagram of a color signal synthesis circuit that can be used in the present invention, and FIG.
The figure is a signal waveform diagram, FIG. 7 is a waveform diagram of a sampling pulse that can be used in the present invention, FIG. 8 is a circuit diagram of a sampling pulse generation circuit, and FIG. 9 is an implementation of the video display device of the present invention. FIG. 10 is a block diagram of another example of a display panel that can be used in the present invention. Xi...X electrode (column electrode), Y...X
Electrode (row electrode), P'111 ""212 P'31・
...Fluorescent material, Xi1i+. ...Common electrode, 9-6...Color signal synthesis circuit, 9-7...Sampling pulse generation circuit, 9-8...Sampling/hold circuit ,9
-12...X electrode drive circuit.

Claims (1)

[Claims] 1. A light-emitting element point formed by an odd-numbered column electrode and a row electrode including a plurality of row electrodes and a plurality of column electrodes is replaced with a light-emitting element point formed by an even-numbered column electrode and row electrode. a matrix display panel that is vertically shifted relative to the matrix display panel; a plurality of common electrodes that connect mutually adjacent pairs of column electrodes of the matrix display panel; and positions of odd-numbered column electrodes in odd-numbered fields. sampling means for sampling an input video signal using a sampling pulse having a phase corresponding to the position of an even-numbered column electrode in an even field; A video display device comprising: means for applying a signal to an electrode; and means for sequentially selecting a plurality of row electrodes of the matrix display panel for one horizontal scanning period. 2. A fluorescent substance formed at the light emitting element points of the matrix display panel such that the light emitting element points of any column electrode of the matrix display panel have the same color and the three primary colors are sequentially repeated in the direction of the row electrodes; The color signal switching means further includes a color signal switching means that switches a pair of input color signals corresponding to the light emitting colors of the light emitting elements of the pair of column electrodes connected to the common electrode for each field and supplies the same to the sampling means as an input video signal. A video display device according to claim 1.