KR101070468B1 - Display system and display method - Google Patents

Abstract

The present invention relates to a display system and a display method, comprising: an LED module comprising a plurality of LED elements; Moving means for moving the observer or the LED module to allow the LED module and the observer to move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen may be formed in the observer's field of view by using an afterimage effect. In order to improve the resolution of the horizontal portion of the screen, an X-axis interlaced area may be generated in which a first pixel formed by an afterimage effect and a second pixel adjacent in the horizontal direction of the first pixel overlap each other. It is characterized in that the horizontal flashing signal is applied to the LED module so that the pitch between the pixels in the X-axis and Y-axis direction is reduced, so that the high-resolution image can be obtained with the same number of LED elements as the softer image without deterioration of image quality. It has an effect that can be played back.

Description

Display system and display method

The present invention relates to a display system and a display method, and more particularly, a first LED element installed in a first LED module to apply a horizontally overlapping blinking signal to an LED module to increase the X-axis resolution, and to increase the Y-axis resolution. The present invention relates to a display system and a display method for reproducing a softer image and a higher resolution image by reducing the pitch between pixels by installing the height of the second LED element and the height of the second LED elements installed in the second LED module.

In general, install an LED module in which a plurality of LED elements (light emitting elements) are arranged one-dimensionally in a tunnel through which the subway passes, and flash the LEDs at high speed while a subway passes, or a plurality of LED elements (light emitting elements) By rotating the LED module arranged in a one-dimensional by a motor and at the same time flashing at high speed according to the angle can be reproduced as well as various characters, graphics, as well as video by the human afterimage effect.

Such a display device is a fixed configuration comprising a plurality of LED elements, the LED module installed at regular intervals in a tunnel through the subway and a control unit for applying a flashing signal to these LED modules, or a plurality of LED elements An LED module, a rotating frame for supporting the LED module, a fixed body for rotationally supporting the rotating frame such that the rotating frame is rotatable, and a motor installed on the fixed body, the motor rotating the rotating frame. It is a rotary configuration.

In particular, as shown in FIGS. 3 and 4, all of the LED modules 1W, 2W, 3W of the conventional display device allow the LED elements 1 to form predetermined reference rotation paths 10. The first LED elements 11 are arranged at predetermined heights H1, H2, H3, H4, and H5.

Here, all the LED modules 1W are arranged in such a manner that the first LED elements 11 vertically have a constant pitch P (y).

Therefore, as shown in FIG. 4, according to the related art display device, the residual image of the blinking LED elements 11 may form the pixel D by forming a constant pitch P (y) in the Y-axis direction. will be.

In addition, the conventional display device can form the pixel D by making a constant pitch P (x) in the X-axis direction according to the time of blinking.

However, in the conventional display device, the heights of the LED elements 1 installed in all the LED modules including the first LED module 1W, the second LED module 2W, and the third LED module 3W are the same, Since the LED elements 11 require a minimum space in which a circuit is to be installed in a process, as shown in FIG. 4, a space is formed between the pixel D and the pixel D in the Y-axis direction to form a space. Since the pixels D and D are not overlapped with each other even in the X-axis direction, there is a limit of the resolution that can be expressed, and thus, a problem that could not provide a clearer and more detailed screen is not provided. there was.

An object of the present invention for solving the above problems, by differentially installing the height of the LED element of the LED module to display the secondary, tertiary and N-order interlaced pixels in the X-axis and Y-axis direction between the reference pixels The present invention provides a display system and a display method for reproducing a high resolution image even with the same number of LED elements by reducing the pitch between pixels.

Display system of the present invention for achieving the above object, the LED module consisting of a plurality of LED elements; Moving means for moving the observer or the LED module to allow the LED module and the observer to move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen may be formed in the observer's field of view by using an afterimage effect. In order to improve the resolution of the horizontal portion of the screen, an X-axis interlaced area may be generated in which a first pixel formed by an afterimage effect and a second pixel adjacent in the horizontal direction of the first pixel overlap each other. It is characterized in that to apply a horizontal overlapping flashing signal to the LED module.

In addition, according to the present invention, the horizontal overlapping blinking signal, the distance between the first pixel and the N pixel that does not overlap the first pixel is referred to as the X-axis reference pitch (P (x)) (Pitch), X When the blinking time for forming the axis reference pitch is referred to as the reference blinking time T, the first pixel and the second pixel form a pitch N / 1 (1 / NP (x)) of the first pixel and the second pixel. It is preferable that the blinking time of the horizontally overlapping blinking signal is 1 / N standard blinking time (1 / NT).

Further, according to the present invention, it is preferable that an overlapping section is formed in which the first pixel and the second pixel adjacent in the horizontal direction of the first pixel overlap each other.

On the other hand, the display system of the present invention for achieving the above object, the LED module consisting of a plurality of LED elements; Moving means for moving the observer or the LED module to allow the LED module and the observer to move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to a plurality of the LED modules so that a screen is formed in the observer's field of view by using an afterimage effect, wherein the LED module comprises: A first LED module in which first LED elements are arranged such that the LED elements form predetermined reference movement paths when the LED module is moved relative to the viewer to improve the resolution of the vertical portion of the screen; And a second LED module in which the second LED elements are arranged at a height different from that of the first LED elements so that a Y-axis interlaced path that is shifted from the reference movement path is formed between the reference movement paths formed by the first LED elements. It characterized by comprising;

Further, according to the present invention, the first LED module, the first LED elements are arranged in a constant pitch (P (y)) (Pitch), the second LED elements of the second LED module, the first It is preferable to arrange | position out 1 1/2 pitch (1 / 2P (y)) with 1 LED element.

On the other hand, the display system of the present invention for achieving the above object, the LED module consisting of a plurality of LED elements; Moving means for moving the observer or the LED module to allow the LED module and the observer to move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen may be formed in the observer's field of view by using an afterimage effect. In order to improve the resolution of the horizontal portion of the screen, an X-axis interlaced area may be generated in which a first pixel formed by an afterimage effect and a second pixel adjacent in the horizontal direction of the first pixel overlap each other. In order to improve the resolution of the vertical portion of the screen, the LED module is to apply a horizontal overlapping flashing signal to the LED module so that the LED elements are a predetermined reference when the relative movement of the LED module relative to the observer A first EL in which the first LED elements are arranged to form movement paths D module; And a second LED module in which the second LED elements are arranged at a height different from that of the first LED elements so that a Y-axis interlaced path that is shifted from the reference movement path is formed between the reference movement paths formed by the first LED elements. It characterized by comprising;

On the other hand, the display method of the present invention for achieving the above object, the LED module consisting of a plurality of LED elements; Moving means for moving the observer or the LED module to allow the LED module and the observer to move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen is formed in the observer's field of view by using an afterimage effect. In order to improve the resolution of the horizontal portion, the first pixel formed by the afterimage effect and the second pixels adjacent to each other in the horizontal direction of the first pixel overlap each other so that an overlapping X-axis interlaced area may be generated. The screen controller may apply a horizontal overlapping blinking signal to the LED module.

On the other hand, the display method of the present invention for achieving the above object, the LED module consisting of a plurality of LED elements; Moving means for moving the observer or the LED module to allow the LED module and the observer to move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen is formed in the observer's field of view by using an afterimage effect. Arranging first LED elements in a first LED module such that the LED elements form predetermined reference movement paths when the LED module moves relative to the viewer so as to improve the resolution of the vertical portion of the screen, and the first LED elements are arranged in the first LED module. Arranging the second LED elements in the second LED module at a height different from that of the first LED elements so that a Y-axis interlaced path that is offset from the reference movement path is formed between the reference movement paths formed by the LED elements. do.

As described above, according to the display system of the present invention, by reducing the pitch between the pixels in the X-axis direction and the Y-axis direction, the high resolution image can be reproduced with the same number of LED elements as the softer image without deterioration of image quality. will be.

1 is a conceptual diagram illustrating a display system according to an exemplary embodiment of the present invention.
2 is a perspective view illustrating a display system according to another exemplary embodiment of the present invention.
3 is an exploded view illustrating a movement path of LED elements of a conventional display device.
4 is a diagram illustrating an example of pixels displayed in the conventional display device of FIG. 2.
5 is a diagram illustrating an example of high-resolution pixels in the X-axis direction displayed in the display system according to an exemplary embodiment of the present invention.
6 is an exploded view illustrating a movement path of the display system of the present invention of FIG. 1 or FIG. 2.
FIG. 7 is a diagram illustrating an example of Y-axis high resolution pixels displayed in the display system of FIG. 6.
8 is an exploded view illustrating a movement path of a display system according to another exemplary embodiment of the present invention.
FIG. 9 is a diagram illustrating an example of Y-axis high resolution pixels displayed in the display system of FIG. 8.
FIG. 10 is a diagram illustrating an example of high resolution pixels in an X-axis and Y-axis direction displayed in a display system according to another exemplary embodiment of the present invention.
It is a figure which shows an example of the 3 mm x 3 mm screen which has a conventional 3 mm pitch of X-axis direction, and 3 mm pitch of Y-axis direction.
12 is a view showing an example of a 1.5mm x 3mm screen having a high resolution in the X-axis direction according to the display method of the present invention.
It is a figure which shows an example of the 1.5 mm x 1.5 mm screen which has X-axis and Y-axis high resolution according to the display method of this invention.
It is a figure which shows another example of the 3 mm x 3 mm screen which has a conventional 3 mm pitch of the X-axis direction, and 3 mm pitch of the Y-axis direction.
15 is a diagram showing another example of a 1.5 mm x 3 mm screen having a high resolution in the X-axis direction according to the display method of the present invention.
16 is a view showing another example of the 1.5mm x 1.5mm screen having the X-axis and Y-axis high resolution according to the display method of the present invention.

Hereinafter, a display system according to various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Embodiments of the invention are not limited to those shown in the accompanying drawings, it is to be noted that various modifications can be made within the scope of the same invention.

1 is a conceptual diagram illustrating an observer mobile display system according to an exemplary embodiment of the present invention, and FIG. 2 is a perspective view illustrating a rotatable display system according to another exemplary embodiment of the present invention.

Here, the LED module (2) and the observer is relatively moved by a moving means, Figure 1 is such a moving means, the subway (100) is carried by moving the observer, Figure 2 is the moving means This, it is a rotary motor (5) for rotating the rotary frame 3, the LED module 2 is installed at a high speed.

As shown in FIG. 1, the observer mobile display system is installed side by side near a tunnel or a track of a subway 100, and includes an LED module 2 and an LED module 2 including a plurality of LED elements 1. It comprises a screen control unit 7 for applying a horizontal superimposed blinking signal to the.

The observer recognizes the first screen by the afterimage effect while the LED module 1W is blinking at a high speed at the position "1", and the LED module 2W is blinking at a high speed at the position "2". While passing, the second screen is recognized by the afterimage effect, and while the LED module 1W is blinking at high speed at the position of "3", the third screen is recognized by the afterimage effect and these screens are continuously passed. You can watch videos as you go along.

Here, as shown in FIG. 5, the screen controller 7 is adjacent to the first pixel formed by the afterimage effect and the horizontal direction of the first pixel so as to improve the resolution of the horizontal portion of the screen. The horizontal overlapping blinking signal is applied to the LED module 2 such that an X-axis interlaced area overlapping the second pixels may overlap.

In the horizontal overlapping blinking signal, a distance between the first pixel D and the Nth pixel that does not overlap the first pixel is referred to as an X-axis reference pitch P (x) and a pitch of the X-axis. When the blinking time forming the pitch is referred to as the reference blinking time T, the first pixel and the second pixel are horizontally formed between the first pixel and the second pixel so as to form a pitch N / 1 (1 / NP (x)). The flashing time of the overlapping flashing signal is the one-th standard flashing time (1 / NT).

In particular, as illustrated in FIG. 5, an overlapping period S overlapping each other is formed between the first pixel D and the second pixel D adjacent in the horizontal direction of the first pixel.

The reason why such an overlap section S is possible is that if the conventional fixed flat panel display in which one LED element is physically in charge of one pixel, the overlap element S may not overlap each other. Is physically impossible, but when one LED element 1 of the present invention flashes at high speed to form a pixel using human afterimage, the pixels are connected to each other along the trajectory of the LED element 1. It is possible to form the overlapping section S overlapping each other.

Therefore, as shown in FIG. 5, the interlaced pixel D is inserted between the reference pixel D and the reference pixel D in the X-axis direction, thereby providing the same number of the same number as in the conventional case shown in FIGS. 2 and 3. By using the LED elements (11, 12) it is possible to implement a high resolution (1/3 P (y)) three times than conventional in the X-axis direction.

On the other hand, as shown in Figure 2, the rotatable display system according to another embodiment of the present invention, the LED module (2) consisting of a plurality of LED elements (1) and for supporting the LED module (2) The rotary frame 3 and the fixed body 4 and the fixed body 4 for rotationally supporting the rotary frame 3 so that the rotary frame 3 is rotatable, the rotary frame 3 In the rotating display comprising a motor 5 for rotating and an outer case 6 covering and protecting the LED module 2, the height between the installed LED elements 11 and 12 is shifted from each other. The first LED module 1W and the second LED module 2W are configured to be included.

The LED device 1 may be applied to all kinds of light emitting devices, and preferably include red (R), green (G), and blue (B) light sources.

Meanwhile, as illustrated in FIG. 6, the first LED module 1W includes a first LED element such that the LED elements 1 form predetermined reference rotation paths 10 when the rotating frame 3 rotates. 11 are arranged at predetermined heights H1, H2, H3, H4, and H5.

In addition, as illustrated in FIG. 6, the second LED module 2W may be configured such that a rotation path 20 that is offset between the reference rotation paths 10 formed by the first LED elements 11 is formed. The second LED elements 12 are arranged at heights H 1 ′, H 2 ′, H 3 ′, H 4 ′, H 5 ′ different from the first LED elements 11.

Accordingly, as shown in FIG. 6, the first LED module 1W is disposed such that the first LED elements 11 have a constant pitch P (y) in the Y-axis direction. The second LED elements 12 of the second LED module 2W alternately form a half pitch (1/2 P (y)) with the first LED elements 11 in the Y-axis direction. It can be deployed.

Therefore, as shown in FIG. 7, the secondary interlaced pixel D 'is inserted between the reference pixel D and the reference pixel D, so that the same number of LEDs as in the conventional case shown in FIGS. By using the elements 11 and 12, a high resolution (1/2 P (y)) of twice as much as the conventional one in the Y-axis direction can be realized.

FIG. 8 is an exploded view illustrating a movement path of a display system according to another exemplary embodiment of the present invention, and FIG. 9 is a diagram illustrating an example of high-resolution pixels in the Y-axis direction displayed in the display system of FIG. 8.

As shown in FIG. 8 and FIG. 9, the display system of the present invention includes a first LED module 1W and a second LED module whose heights between the installed LED elements 11, 12, 13 are shifted from each other. 2W) and the third LED module 3W.

As illustrated in FIG. 8, the first LED module 1W may be configured such that the LED elements 1 form predetermined reference movement paths 10 when the rotation frame 3 is rotated or when the observer moves. 1 LED elements 11 are arranged at predetermined heights H1, H2, H3, H4, and H5.

In addition, as illustrated in FIG. 8, the second LED module 2W may be configured such that a rotation path 20 that is offset between the reference rotation paths 10 formed by the first LED elements 11 is formed. The second LED elements 12 are arranged at heights H 1 ′, H 2 ′, H 3 ′, H 4 ′, H 5 ′ different from the first LED elements 11.

In addition, as illustrated in FIG. 8, the third LED module 3W may be configured such that a rotation path 30 that is offset between the reference rotation paths 10 formed by the first LED elements 11 is formed. The third LED elements 13 are arranged at heights H1 ″, H 2 ″, H 3 ″, H 4 ″, H 5 ″ that are different from the one LED elements 11 and the second LED elements 12. Will be.

Here, in addition to the third LED element 13 and the third LED module 3W, various numbers of N-th order LED elements and N-th order LED modules such as fourth, fifth, sixth, seventh, and eighth may be applied. will be.

Accordingly, as shown in FIG. 8, the first LED module 1W is disposed such that the first LED elements 11 have a constant pitch P (y) in the Y-axis direction. The third LED elements 13 of the third LED module 3W may be arranged to be offset from the second LED elements 12 by a third pitch (1/3 P (y)) in the Y-axis direction. It can be.

Therefore, as shown in FIG. 9, the secondary interlaced pixel D 'and the tertiary interlaced pixel D "are inserted between the reference pixel D and the reference pixel D in the Y-axis direction, and thus, FIGS. By using the same number of LED elements (11, 12, 13) as in the conventional case shown in Figure 3 it is possible to implement a high resolution (1/3 P (y)) three times the conventional in the Y-axis direction.

FIG. 10 is a diagram illustrating an example of high resolution pixels in an X-axis and Y-axis direction displayed in a display system according to another exemplary embodiment of the present invention.

That is, in the X-axis direction, the screen controller 7 applies a horizontally overlapping blinking signal to the LED module 2 to implement a high resolution (1/3 P (x)) that is three times higher than the conventional one, and at the same time, the Y-axis In the direction, the third LED elements 13 of the third LED module 3W have a third pitch (1/3 P (y)) in the Y-axis direction with the second LED elements 12. It is possible to implement a high resolution (1/3 P (y)) is three times larger than conventionally arranged in the Y-axis direction by shifting.

Therefore, although a high resolution image is conventionally converted to a low resolution according to the resolution of a displayer, the present invention can reproduce a high resolution image as it is without deterioration in image quality in the X and Y axis directions.

11 is a view showing an example of a 3mm x 3mm screen having a conventional 3mm pitch in the X-axis direction and 3mm pitch in the Y-axis direction, Figure 12 is a 1.5mm x 3mm screen having a high resolution in the X-axis direction according to the display method of the present invention Fig. 13 is a diagram showing an example of a 1.5 mm x 1.5 mm screen having the X-axis and Y-axis high resolution according to the display method of the present invention.

That is, as shown in FIG. 11, a conventional 3mm × 3mm low-resolution screen may be displayed as a high-resolution 1.5mm × 3mm screen in the X-axis direction, as shown in FIG. 12, and as shown in FIG. 13. Similarly, it is possible to display a high resolution 1.5 mm x 1.5 mm screen in the X-axis and Y-axis directions.

On the other hand, Figure 14 is a view showing another example of a 3mm x 3mm screen having a conventional 3mm pitch in the X-axis direction and 3mm pitch in the Y-axis direction, Figure 15 is 1.5mm having a high resolution in the X-axis direction according to the display method of the present invention It is a figure which shows another example of a x3 mm screen, and FIG. 16 is a figure which shows another example of the 1.5 mm x 1.5 mm screen which has X-axis and Y-axis high resolution according to a display method.

In particular, the drawings showing another example of the conventional 3mm × 3mm screen shown in FIG. 14 are all inaccurate numbers indicating the font size shown on the left, so that the resolution is not much lowered and the sharpness is also greatly reduced to identify the numbers of all font sizes. 15 was very difficult, but according to the drawing showing another example of the 1.5 mm x 3 mm screen having the X-axis high resolution of the present invention, the identification of the numbers of the font sizes "10" and "9" It can be seen that the resolution and the clarity are increased as much as possible, and as shown in Fig. 16, according to the drawing showing another example of the 1.5mm x 1.5mm screen having the X-axis and Y-axis high resolution of the present invention, the font size is shown. It can be seen that resolution and clarity are greatly increased so that the identification of all numbers ranging from "10", "9", "8", and "7" is clear.

In the case of the rotating display system, the rotation speed of the LED module 2 is 42.4 km / h, and the conventional resolution has to be expressed as 512 × 384 in the horizontal and vertical resolutions. The resolution using the method can be extended to 1024 × 768.

 In this case, the data transfer amount can also be doubled from 35.4 Mbyte / s to 70.8 Mbyte / s using the display system and display method of the present invention, and the pitch interval at this time is 256.65. By using the display system and display method of the present invention in ms it can be reduced to 127.32 to provide more information.

The present invention is not limited to the above-described embodiments, and of course, modifications may be made by those skilled in the art without departing from the spirit of the present invention.

Therefore, the scope of the claims in the present invention will not be defined within the scope of the detailed description, but will be defined by the following claims and their technical spirit.

1: LED element 2: LED module
3: rotating frame 4: fixed body
5: motor 6: outer case
10: reference rotation path 11: first LED element
1W: first LED module 20, 30: shifted rotation path
12: second LED element 2W: second LED module
P (x): pitch in the X axis P (y): pitch in the Y axis
D: reference pixel D ': secondary interlaced pixel
D ": 3rd order interlaced pixel 13: 3rd LED element
3W: Third LED Module 7: Screen Control
100: subway

Claims (13)

LED module consisting of a plurality of LED elements; Moving means for moving the viewer or the LED module such that the LED module and the viewer viewing the LED module move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen may be formed in the observer's field of view by using an afterimage effect.
The screen control unit may include an X-axis interlace period in which a first pixel formed by an afterimage effect and a second pixel adjacent in the horizontal direction of the first pixel overlap each other so as to improve the resolution of the horizontal portion of the screen ( And a horizontal overlapping blinking signal is applied to the LED module to generate an interlaced area. The method of claim 1,
The horizontal overlap flashing signal,
A distance between the first pixel and the N pixel that does not overlap the first pixel is referred to as an X-axis reference pitch (P (x)) (Pitch), and a blinking time for forming an X-axis reference pitch is referred to as a reference blinking time (T). ), The flashing time of the horizontal overlapping flashing signal between the first pixel and the second pixel is equal to 1 / N so that the first pixel and the second pixel form a pitch of 1 / N (1 / NP (x)). Display system characterized in that the blinking time (1 / NT). The method of claim 1,
And a superimposition section overlapping each other between the first pixel and a second pixel adjacent in the horizontal direction of the first pixel. delete delete delete delete LED module consisting of a plurality of LED elements; Moving means for moving the viewer or the LED module such that the LED module and the viewer viewing the LED module move relative to each other; And a screen controller configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen may be formed in the observer's field of view by using an afterimage effect.
The screen control unit may include an X-axis interlace period in which a first pixel formed by an afterimage effect and a second pixel adjacent in the horizontal direction of the first pixel overlap each other so as to improve the resolution of the horizontal portion of the screen ( To apply a horizontally overlapping flashing signal to the LED module to generate an interlaced area,
The LED module may include a first LED in which first LED elements are arranged such that the LED elements form predetermined reference movement paths when the LED module is moved relative to the viewer to improve the resolution of the vertical portion of the screen. module; And
A second LED module in which second LED elements are arranged at a height different from that of the first LED elements so that a Y-axis interlaced path that is offset from the reference movement path is formed between the reference movement paths formed by the first LED elements; Display system comprising a. The method of claim 8,
The horizontal overlap flashing signal,
A distance between the first pixel and the N pixel that does not overlap the first pixel is referred to as an X-axis reference pitch (P (x)) (Pitch), and a blinking time for forming an X-axis reference pitch is referred to as a reference blinking time (T). ), The flashing time of the horizontal overlapping flashing signal between the first pixel and the second pixel is equal to 1 / N so that the first pixel and the second pixel form a pitch of 1 / N (1 / NP (x)). Flashing time (1 / NT),
N-th order LED module in which N-th order LED elements are arranged at a height different from the first LED elements and the second LED elements so that a Y-axis interlaced path is formed between the reference movement paths formed by the first LED elements. ;
Display system characterized in that it further comprises. The method according to claim 1 or 8,
The moving means is a display system, characterized in that the subway to move the observer. The method according to claim 1 or 8,
The moving unit is a display system, characterized in that the rotating motor for rotating the rotating frame in which the LED module is installed at high speed. LED module consisting of a plurality of LED elements; Moving means for moving the viewer or the LED module such that the LED module and the viewer viewing the LED module move relative to each other; And a screen control unit configured to apply a flashing signal of the LED module to the plurality of LED modules so that a screen is formed in the observer's field of view by using an afterimage effect.
An X-axis interlaced area is generated in which a first pixel formed by an afterimage effect and a second pixel adjacent in the horizontal direction of the first pixel overlap each other so as to improve the resolution of the horizontal portion of the screen. The display control method of the display system, characterized in that the screen control unit applies a horizontal overlapping flashing signal to the LED module. delete

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