JPS5822756B2 - 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 electrode is X□. X2..., the X electrode is indicated by Y□+Y2..., and the intersection pH...Pij
indicates the luminescent element point.

When displaying television images using such a display panel, line at; It was necessary to perform interlaced scanning.

That is, a pulse for selecting one horizontal scanning period is applied to every other X electrode, and the input video signal is sampled to each X electrode, stored in memory, converted into a parallel signal, and then applied at the same time.

In such a matrix display panel, if the number of X electrodes is halved, the number of scan lines that can be displayed is simply halved, resulting in deterioration of image quality.

Therefore, an object of the present invention is to provide a video display device that can reduce the number of X electrodes by half without deteriorating the image quality.

FIG. 2 is a configuration diagram of a display panel that can be used in the present invention.

In FIG. 2, Yl, Y2... are row electrodes, that is, X
Indicates electrodes, and Xo, X2, . . . indicate one row of electrodes, that is, X electrodes.

P... indicates a luminescent element point.

Y electrode Y1 of this display panel. Y2... is a common electrode in which a pair of mutually adjacent row electrodes are commonly connected.

A display panel that constitutes such light emitting element points Pij can be made, for example, in a gas discharge panel, by arranging holes in an intermediate sheet that constitutes discharge cells.

The difference from conventional display panels is that signals of two scanning lines can be commonly displayed using one X electrode.

That is, for example, if the Y electrode is selected in an odd field, the signal of the j-th scanning line of the odd field is applied to the odd X electrode X2-1, and if the X electrode is selected in an even field, It is sufficient to apply the signal of the third scanning line of the field to the even-numbered X electrodes X21.

Therefore, the X electrodes can be selected sequentially regardless of the odd or even number of fields, and vertical resolution can be maintained.

On the other hand, horizontal resolution can also be maintained by changing the selected position of the X electrode for each field.

FIG. 3 shows a configuration diagram of a video display device that enables the above-described operation.

That is, FIG. 3 is a block diagram of one embodiment of the video display device of the present invention.

In Fig. 3, 3-1 is the display panel shown in Fig. 2;
3-2 is a video signal amplification circuit, 3-3 is a sampling pulse generation circuit that generates sampling pulses, 3-4 is a sampling/holding circuit, 3-5 is a pulse width converter,
3-6 is a reference sawtooth wave generator for pulse width conversion; 3-1
Reference numeral 3-8 indicates a column electrode selection switch circuit, 3-8 a timing pulse generator, 3-9 a panel dry stage, and 3-10 a row electrode selection pulse generator which receives a signal synchronized with a horizontal synchronization signal.

Figure 4 shows the waveforms of the signals at each part in Figure 3. Show the diagram.

In FIG. 4, 4-1 is the input video signal waveform, and the shaded portion is the sampled portion.

Reference numerals 4-2 and 4-3 indicate, for example, sampling pulses for odd-number fields, which have a period TH·('rH: i horizontal scanning period) and a pulse width Ts.

4-4 and 4-5 indicate sampling pulses for even fields.

4-6 to 4-8 are output waveforms of the row electrode selection pulse generator 3-10 in FIG. 3, and represent row electrode selection pulses.

Next, the operation will be explained with reference to FIGS. 3 and 4.

explain.

The input video signal is sampled by a pulse from a sampling pulse generation circuit 3-3 in a sample link/hold circuit 3-4.

As shown in FIG. 4, the sampling pulse has a pulse width for each field for the nth scanning line signal.

The phase is shifted by Ts, and by doing so, a sampling pulse having a phase corresponding to the position of each X electrode can be obtained.

This sampled signal is held and pulse width modulated by a pulse width converter 3-5.

The output signal is switched for each field by the switch circuit 3-1 and applied to the odd or even numbered X electrodes.

The switch circuit 3-7 can be easily made by combining AND gate circuits.

On the other hand, signals with pulse widths TH shown in 4-6 to 4-8 in FIG. 4 are sequentially applied to the X electrode.

Next, an example of the sampling pulse generation circuit 3-3 is shown in FIG.

In FIG. 5, 5-1 is a gate signal input terminal synchronized with a horizontal synchronizing signal, and 5-2 is a synchronous oscillator, the oscillation frequency of which is determined depending on the number of X electrodes.

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

In operation, first the output of the oscillator 5-2 is sent to the counter 5-2.
Count at 3, take out the 1st and 2nd pulse,
These pulses are input to the NAND circuit 5-5 using the outputs Q and Q of the flip-flop 5-5 which inputs the vertical synchronizing signal.
6.5-7, and this gate output signal starts the shift register 5-9.

Therefore, the output terminal 5-10 has terminals 4-2 to 4 in FIG.
The sampling pulse shown in -5 can be obtained.

On the other hand, since the flip-flop signals Q and Q are synchronized with the vertical synchronization signal, they can be used as timing pulses for operating the switch circuit 3-7 in FIG.

Further, another example of a display panel that can be used in the present invention is shown in FIG.

The X electrode in FIG. 6 can be configured to have a zigzag pattern, for example, by vapor deposition.

Moreover, the X electrode X1. X2... and X electrode X1. Y2
... are the same as those in FIG. 2, and a light emitting element point is formed at their intersection.

Next, color display will be described.

The color display panel has a light emitting element point P□ as shown in FIG.
,.

This is achieved by coating P2□ and P3 with phosphors that emit red, green, and blue light.

In this case, in the case of an odd field, X□, X7. ...X
A red signal is applied to the X electrode of 61+1, and X3. X...
Apply a blue signal to the X electrode of X61+3, and X□1・
...A green signal is applied to the X electrode of X6□10, and in the case of an even field, X2. A green signal is applied to the X electrodes of X8...X6i+, X4. A red signal is applied to the X electrodes of X1o...X6i+, and X6. A blue signal may be applied to the X electrodes of X□2...X61+6.

That is, when sampling the input video signal, the color signals are R-G-R-G..., B-R-B for each field.
-R... and G-B-G-B...

FIGS. 8 and 9 show a color signal switching circuit and its waveform diagram.

In FIG. 8, switch 8-1 is controlled by a vertical synchronization signal, and its outputs are ERG, EGB, and EBR.

The shapes are as shown in 9-1 to 9-3 in FIG.

Here, TV indicates one field period.

By guiding these signals as input video signals to a sampling circuit, color display can be performed in the same way as monochromatic display.

FIG. 10 is a block diagram of a color video display device to which the present invention is applied.

In FIG. 10, the display panel 10-1 is the display panel shown in FIG. 7, the color signal switching circuit 10-2 is the color signal switching circuit shown in FIG. 8, and the other parts are the same as those in FIG. 3. 2, corresponding parts are given the same reference numerals.

Note that even when the number of sampling circuits and memory circuits is equal to the number of individual X electrodes, the X electrode scanning circuit can be formed using the above-described method.

In this case, in the X electrode drive circuit, the column electrode selection z switch circuit 3-1 shown in FIG. 3 is unnecessary, but all pulses from the output terminal of the sampling pulse generation circuit 3-3 are used. sampling and holding, pulse width modulation, and the output is sent to terminal 5-1 in Figure 5 through a gate circuit.
Control may be performed using the signal No. 1.

Furthermore, the sampling pulse generation circuit shown in FIG. 5 only requires an oscillation circuit 5-2 and a shift register 5-9 (all output terminals are used), and the shift register 5-9 is started by the horizontal synchronizing signal. A synchronized gate signal may be used.

As described above, according to the video display device of the present invention, the number of X electrodes can be halved without deteriorating the image quality, and by sequentially selecting the X electrodes, interlaced scanning display is possible. , the number of i-sampling circuits can be reduced by half, which is very effective.

[Brief explanation of the drawing]

FIG. 1 is an electrode layout diagram of a conventional display panel, FIG. 2 is a plan view of a display panel that can be used in the present invention, FIG. 3 is a configuration diagram of an embodiment of the video display device of the present invention, and FIG. 5 is a block diagram of the main parts of the device shown in FIG. 3, FIG. 6 is a plan view of another example of the display panel that can be used in the present invention, and FIG. Figure 7 is a plan view of a color display panel that can be used in this invention;
Fig. 8 is a configuration diagram of a color signal switching circuit essential for color display, Fig. 9 is a signal waveform diagram for explaining its operation, and Fig. 10
The figure is a configuration diagram of a color video display device to which the present invention is applied. Xi...X electrode (column electrode), Y...
X electrode (row electrode), Plo, P20. P3...
- Phosphor, 3-3...Sampling pulse generation circuit, 3-4...Sampling hole ■ path,
3-7...Switch circuit for column electrode selection, 3-1
0...Pulse generation circuit for row electrode selection, 10-2
...Color signal switching circuit.

Claims (1)

[Scope of Claims] 1. A first light-emitting element point group including a plurality of row electrodes and a plurality of column electrodes and provided at positions corresponding to a negative row electrode and an odd-numbered column electrode; and a second light-emitting element point group provided at a position corresponding to the even-numbered column electrode and shifted in the column electrode direction with respect to the first light-emitting element point group; sampling means for sampling an input video signal using a sampling pulse whose phase corresponds to the position of the odd-numbered column electrode and corresponds to the position of the even-numbered column electrode in the even field; and an image sampled by the sampling means. A video display device comprising: signal applying means for applying a signal to corresponding electrodes of the column electrodes; and means for sequentially selecting the 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; Claim 1, further comprising color signal switching means for switching a pair of input color signals corresponding to the luminescent color of the light emitting element points of the row electrodes for each field and supplying the same to the sampling means as an input video signal. The video display device described in Section 1.