JPS5822758B2 - 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 FIG. 1, X electrodes X1. X2... and Y electrode ¥1. The intersection point P of ¥2... indicates the light-emitting element point.

When displaying television images using such a display panel, line-at-time display is possible in consideration of rising speed and brightness.

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

In such a matrix display panel, it is possible to reduce costs by halving the number of X electrodes, but
The number of scan lines that can be displayed is reduced by half, 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.

The Y electrodes ¥1, ¥2, etc. of this display panel are common electrodes in which a pair of mutually adjacent row electrodes are respectively connected in common.

In FIG. 2, Yl, \2, . . . indicate row selection electrodes, ie, X electrodes, and Xl, X2, . . . indicate column selection electrodes, ie, X electrodes.

Pij indicates a luminescent element point. A display panel configuring such light-emitting element points, for example, in a gas discharge panel, can be made by punching holes configuring cells in an intermediate sheet.

The difference from the conventional method is that signals of two scanning lines can be displayed using one X electrode.

That is, when Y electrode Yj is selected, the signal of the first scanning line is applied to X electrode X21-1, and (j+1
)-th scanning line signal may be applied to the X electrode X21.

Therefore, while selecting the Y electrode Yj for two horizontal scanning line periods, by giving a signal to the X electrode X2i in the first one horizontal scanning period and giving a signal to the X electrode X21 in the next one horizontal scanning period, Horizontal and vertical resolution can be maintained.

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 amplifier; 3. -3 is a sampling pulse generation circuit, 3-4 is a sampling/hold circuit, 3
-5 is a pulse width converter, 3-6 is a reference sawtooth wave generator for pulse width conversion, 3-7 is a switch circuit for column electrode selection,
3-8 is a timing pulse generator, 3-9 is a panel drive circuit, and 3-10 is a row electrode selection pulse generator whose input is a signal synchronized with a horizontal synchronization signal.

FIG. 4 shows a waveform diagram of FIG. 3.

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

4-2 and 4-3 show sampling waveforms, 'rH
+'rs, 'rH-'rs (where TH: 1 horizontal scanning period, Ts: sampling pulse width).

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

4-4 and 4-5 are column electrode selection switches 3- in Figure 3.
This is the timing pulse for operating the timing pulse generator 3-8, and is the output waveform of the timing pulse generator 3-8.

4-6 and 4-7 are output waveforms of the row electrode selection pulse generator 3-10 in FIG. 3, and represent the X electrode selection pulse.

Next, the operation will be explained using FIGS. 3 and 4.

The input video signal is sampled by the sampling/holding circuit 3-4 using the pulse obtained from the output terminal of the sampling pulse generation circuit 3-3, and then sent to the pulse width converter 3.
-5 pulse width modulation.

This output signal is switched by the switch circuit 3-7 every horizontal scanning line and is 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, a signal having a pulse width of two horizontal scanning periods is applied to the X electrode as described above.

FIG. 5 is a circuit diagram of the sampling pulse generation circuit 3-3.

In FIG. 5, 5-1 is a gate signal input terminal synchronized with a horizontal synchronizing signal, 5-2 is a synchronous oscillator, and the oscillation frequency 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,
This shows that sampling pulses are taken out from the output terminals of every other stage of the shift register 5-9.

The operation of this circuit is as follows: First, the output of the oscillator 5-2 is counted by the counter 5-3, the first and second pulses are taken out, and these pulses are reset by the vertical synchronizing signal and synchronized with the horizontal synchronizing signal. NAND using the outputs Q and Q of the flip-flop 5-5 which receives the signal as input.
It is gated by circuits 5-6 and 5-7, and the gate output signal starts the shift register 5-9.

Therefore, one of the output terminals 5-10 receives a pulse with a pulse width Ts every IH (horizontal scanning period) of the horizontal synchronizing signal.
It is obtained with a repetition period of rH+'Il', s,'TH-T3.

Furthermore, since the Q and Q signals of the flip-flop 5-5 are controlled by the vertical synchronizing signal, this signal can be used as an operation timing pulse for the switch circuit 3-7 in FIG.

FIG. 6 is a configuration diagram of another example of a display panel that can be used in the present invention.

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 Y electrode Y1. ￥2
... are the same as those in FIG. 2, and a light emitting element point is formed at their intersection.

Next, color image display will be described.

The color display panel has a light emitting element point P1 as shown in FIG.
This is achieved by coating □, P2□, and P3 with phosphors that emit red, green, and blue light.

That is, when sampling the input video signal, the color signal is 370-R2O..., B-R- for each horizontal scanning period.
You can read it by switching to B-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 horizontal synchronizing signal and outputs EJRG, EGB, E
If it is BR, its waveform diagram will be as shown in 9-1 to 9-3 in FIG.

Here, TH indicates one horizontal scanning 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 10-8 is the color signal switching circuit shown in FIG. 8, and the other parts are the same as those shown in FIG. Since they are the same, corresponding parts are given the same reference numerals.

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

In this case, the column electrode selection switch circuit 3-7 shown in FIG. 3 is unnecessary in the X electrode drive circuit;
All pulses at the output terminal of the sampling pulse generation circuit 3-3 are used for sampling and holding, pulse width modulation is performed, and the output is sent to the terminal 5-11 in Fig. 5 through a gate circuit.
Control can be performed using the signal.

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 start of this shift register 5-9 is synchronized with the horizontal synchronizing signal. A gate signal may be used.

As described above, according to the video display device of the present invention, the number of Y electrodes can be reduced to half of the conventional one without deteriorating the image quality, and the number of X electrode drive circuits can also be reduced to half of the conventional one.

Furthermore, the memory and pulse width conversion circuit in the X electrode drive circuit can also be reduced by half.

[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. FIG. 5 is a block diagram of the main parts of the device shown in FIG. 3, and FIG. 6 is a plan view of another example of the display panel that can be used in the present invention. FIG. 7 is a plan view of a color display panel that can be used in this invention;
Figure 8 is a configuration diagram of the color signal switching circuit necessary for color display, Figure 9 is a signal waveform diagram for explaining its operation, and Figure 10 is a diagram of the signal waveform for explaining its operation.
The figure is a configuration diagram of a color video display device to which the present invention is applied. Xi...X electrode (column electrode), Yj...
Y electrode (row electrode), Pit $ P2□, P3. ...
...Fluorescent material, 3-3...Sampling pulse generation circuit, 3-4...Sampling/hold circuit, 3-7...Column electrode selection 3-10... 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 a position corresponding to a - row electrode and an odd-numbered column electrode; a matrix display panel having a second light-emitting element point group provided at a position corresponding to a row electrode and an even-numbered column electrode and shifted in the column electrode direction with respect to the first light-emitting element point group; a sampling means for sampling an input video signal using a sampling pulse having a phase corresponding to the position of a column electrode of a matrix display panel; and a signal application for applying the video signal sampled by the sampling means to a corresponding electrode of the column electrode. and means for sequentially selecting row electrodes of the matrix display panel every two horizontal scanning periods. 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; Claims further comprising color signal switching means that switches a pair of input color signals corresponding to the luminescent color of the light-emitting element points of the row electrodes every horizontal scanning period and supplies them as input video signals to the sampling means. The video display device according to item 1.