JPS5949752B2 - Eizohiyoujisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video display device using an XY matrix type display device such as a gas discharge panel or an EL panel, and the present invention simplifies the driving circuit of the matrix type display device and enables display of television signals. The purpose is to make it easier.

Conventionally, as a flat panel display device, an X-Y matrix type display device is often used, which is composed of a large number of row lines extending in the horizontal direction and a large number of column lines extending in the vertical direction. .

However, all of these devices emit light at all intersections between the x-axis electrode and the Y-axis electrode, making the drive circuit extremely complicated. For this reason, recent attempts have been made to provide light-emitting element points only at the intersections of odd-numbered row and column electrodes and at the intersections of even-numbered row and column electrodes, as shown in FIG. In this case, when the 2nth and 2n+lth column electrodes are connected to the same drive circuit and the 2nth row electrode is selected, the video signal corresponding to the 2nth column electrode is added, and the 2n+1th column electrode is connected to the 2nth row electrode. When a row electrode is selected, if a video signal corresponding to the 2n+1 column electrode is applied, all the light emitting element points can be driven by half the number of drive circuits for the column electrodes. FIG. 2 shows an example of an X-Y matrix type display device in which two adjacent column electrodes are internally connected.

In Figure 1, X,,X.

. . . is each row electrode extended in the horizontal direction, Y, .
Y. . . . is each column electrode extending q in length in the vertical direction,
P and P' indicate respective light emitting element points. Also the second
In the figure, X,,X. ...... is each row electrode, Y,
, , Y, , O, Y, , 0, . . . indicate respective column electrodes that are internally connected to each other. Next, a conventional example of a drive circuit for driving a matrix type display device having such a configuration will be explained with reference to FIGS. 3 and 4. FIG. 3 is an explanatory diagram showing the time relationship of sampling pulses applied to each column electrode Xl, X2, . . . of the matrix type display device. 3-3 and 3-4 are sampling pulses for sampling the signals that drive odd-numbered column electrodes Yl, Y3, and Y5, respectively; similarly, 3-5, 3-6, and 3-7 are sampling pulses for even-numbered column electrodes Yl, Y3, and Y5. column electrodes Y2, Y4
, Y6.

It should be noted here that the time relationship between sampling pulses 3-2 and sampling pulses 3-5 is not at equal intervals, and if the repetition period of the video signal is TH and the sampling period is 2τ, then the sampling pulse 3-2 starts. The time from the start of the sampling pulse 3-5 to the start of the sampling pulse 3-5 is TH+τ, and conversely, the time from the start of the sampling pulse 3-5 to the start of the sampling pulse 3-2 is TH-τ.

Therefore, the sampling pulse of the drive circuit connected to the electrode Yl2, which connects the column electrode Y1 and the column electrode Y2, is as follows.
It is necessary to have cycles of TH+τ and TH−τ alternately, not at equal intervals. For this purpose, for example, a circuit as shown in FIG. 4 is used.

That is, in FIG. 4, 4-1 is an XY matrix type display device, and 4-2 is sequential row electrodes Xl, X2, . . .
4-1 is a video signal generator, 4-4 is a video signal generator. 4-5 is a driving device that samples the video signal using the sampling pulse and applies it to the column electrodes Y3, 4; 6 is a device 4 for sequentially driving sampling pulses.
-4, 4-5, 4-7 is the original oscillator for sampling pulses, 4-8 is the original oscillator 4-7
a delay device for delaying the output pulse of by τ, 4-
Reference numeral 9 designates a switch mechanism for turning on or off the delay device 4z-8 depending on whether an odd or even row electrode is selected. With this configuration, it is possible to obtain sampling pulses as shown in FIG. 3 and display images.

However, in this case, the sampling pulse processed by the delay device 4-8 and the switch mechanism 4-9 has a frequency two to three times as high as that of the video signal, and thus requires an expensive circuit as a whole.

The present invention attempts to achieve this at low cost by other means.

The video display device of the present invention will be described below along with the embodiments shown in FIGS. 5 and 6.

The present invention attempts to change the time relationship of video signals instead of changing the time relationship between the sampling pulses for odd-numbered column electrodes and the sampling pulses for even-numbered column electrodes.

In FIG. 5, 5-1 and 5-2 indicate video signals, and by passing the video signal 5-1 through a delay line with a delay time τ, a video signal 5-2 is delayed by τ from the video signal 5-1. get.

Then, when the odd-numbered row electrodes Yl, Y3, . . . are selected, the delayed video signal 5-2 is selected, and the even-numbered row electrodes Y2, Y4, . When the original video signal 5-1 is being applied to the respective sampling circuits. Therefore, in this case, the sampling pulses 5-3, 5-4, and 5-5 may be sequentially applied to the respective column electrodes Yl2, Y34, and Y56 at equal periods of TH. FIG. 6 is a block diagram of one embodiment of the video display device of the present invention, in which 6-1 is an X-Y matrix type display device, 6-2 is a sequential row electrode
row electrode selection device 6-3, 6-4 for selecting column electrodes Yl2, Y
6-5 is a sampling pulse generator, 6-6 is a video signal generator, 6-7 is a delay device that delays the video signal by delay time τ, and 6-8 is a sampling circuit that samples the video signal applied to 34. This is a switch that turns the delay device 6-7 on or off depending on whether an odd-numbered row electrode or an even-numbered row electrode is selected.

With this configuration, sampling similar to the conventional one is possible, and the delay devices 6-7 can be switched within the frequency of the video signal, and the overall configuration is inexpensive.

In the embodiment, each row electrode Xl,
Although the case has been described in which X2 .

In this case, by switching the switches 6-8 at the field cycle, images can be displayed in exactly the same way as in the previous embodiment. Further, although the embodiment has described the display of black and white images, the display of color images can also be configured in the same way. Furthermore, in the above explanation, the case where two adjacent column electrodes are connected to the same drive circuit is illustrated, but of course, the same applies to the case where separate drive circuits are provided for each column electrode. can.

As is clear from the above embodiments, the present invention delays the video signal by a time corresponding to approximately 1/2 of the repetition period of the sampling signal, while the even-numbered row electrodes of the matrix display device are selected. samples the delayed video signal and applies it to the row electrode, and while the odd row electrode is selected, samples the original undelayed video signal and applies it to the odd row electrode. The time relationship of the sampling signals can be made completely equal intervals, and the switching between the video signal and the delayed video signal can be performed sufficiently within the frequency range of the video signal. As a result, the drive circuit as a whole can be significantly simplified.

If interlaced scanning is configured to select odd-numbered row electrodes for odd-numbered fields and select even-numbered row electrodes for even-numbered fields, so-called current television signals can be displayed as images as they are.

[Brief explanation of the drawing]

Figs. 1 and 2 are explanatory diagrams of an X-Y matrix type display device, Fig. 3 is an explanatory diagram showing the time relationship of sampling pulses used in a conventional video display device, and Fig. 4 is an explanatory diagram of a conventional video display device. FIG. 5 is an explanatory diagram showing the relationship between a video signal and a sampling signal in the video display device of the present invention, and FIG. 6 is a program diagram of an embodiment of the video display device of the present invention. 6-1... Matrix type display device, 6-
2... Row electrode selection device, 6-3, 6-4...
...Sampling circuit, 6-5 ...Sampling pulse generator, 6-6 ...Video signal generator, 6-7 ...Delay device, 6
- 8...Switch.

Claims (1)

[Claims] 1 Consisting of a large number of row electrodes extending in the horizontal direction and a large number of column electrodes extending in the vertical direction, each having an intersection point between an even numbered row electrode and an even numbered column electrode, and each having an odd numbered number. a matrix type display device comprising a light emitting element point formed at the intersection of a row electrode and an odd numbered column electrode; means for sampling a video signal and applying it to each column electrode of the matrix type display device; means for sequentially selecting the row electrodes, and means for delaying the video signal by approximately 1/2 of the repetition period of the sampling pulse for sampling the video signal during the period when the even-numbered row electrodes are selected; A video display device characterized in that the video display device is configured to display a video based on the video signal using the matrix type display device. 2. The means for sequentially selecting a large number of row electrodes includes means for sequentially selecting even-numbered row electrodes during even-numbered fields of the video signal, and sequentially selecting odd-numbered row electrodes during odd-numbered fields; 2. The video display according to claim 1, further comprising means for delaying the video signal by approximately 1/2 of the repetition period of the sampling pulse for sampling the video signal during the period when the row electrode is selected. Device.