JPH096285A - LED display - Google Patents

Abstract

(57) [Summary] [Objective] It is an object to provide a high-brightness LED display device that can realize a highly reliable connection relationship even when a large-sized display device is configured. [Structure] Dot matrix type LED display unit 2
An image data receiving means 3 for receiving the input image data, an image data selecting means 4 for determining a transfer destination of the received image data, and an image data other LED display device 1.
Image data transmitting means 5 for transmitting image data, a plurality of image data storing means for storing image data, a plurality of display driving means 8a, 8b, 8p for driving light emission, and a plurality for controlling the image data storing means and the display driving means. Display control means 7a, 7
b and 7p.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display device capable of high-quality and high-luminance display which can be used for displaying an image of a television receiver or a VTR.

[0002]

2. Description of the Related Art In recent years, the development of high-brightness blue LEDs has led to rapid development of large full-color LED display devices capable of achieving high visibility outdoors. Such LED display devices have begun to be applied to video and guidance displays in sports and leisure facilities, outdoor advertisements and window advertisements.

A conventional LED display device will be described below. FIG. 5 is a block diagram showing the configuration of a conventional LED display device. In the conventional LED display device 2, 2 is a dot matrix type LED arranged on a dot matrix.
The display unit 3 is an image data receiving means for receiving input image data from a display signal generating source (not shown), 6a,
Reference numerals 6b and 6c denote red, blue and green image memories for storing the image data received by the image data receiving means 3, respectively.
Display control means 8a, 8b, 8c for controlling each image memory and transferring data to the display drive means.
Is a display driving means for driving the dot matrix type LED display unit 2 to emit light.

The operation of the conventional LED display device 9 configured as described above will be described below with reference to FIG. Input image data from a display signal generation source (not shown) is received by the image data receiving means 3. The received image data is temporarily stored in the image memories 6a, 6b and 6c of the respective colors. This image data is read out by each display control means and transferred to each display drive means. As a result, each display driving means causes each L on the dot matrix type LED display unit 2 based on the transferred image data.
The ED is driven to emit light by controlling the light emission time, for example.

[0005]

However, in the above-mentioned conventional configuration, when a large-sized display device is constructed, one LED display device usually has only about 16 dots × 16 dots. Therefore, a plurality of LED display devices are used. Although it will be configured, the connection relationship as shown in FIG.
As shown in FIG. 6C, it is necessary to separately provide a data transfer means. That is, in the connection relationship of FIG. 6B, since a part of the LED full-color display device is far from the display signal generation source, signal delay becomes a problem, and in order to prevent this, FIG. In FIG. 6C for realizing the same connection relationship as in a), as described above, the data transfer means and the control means therefor are separately required, which increases the cost of the device and makes it impossible to take sufficient time for display driving. There was a problem in terms of realizing high brightness.

The present invention solves the above-mentioned problems of the prior art. Even when a large-sized display device is constructed, a connection relationship in which the LED display devices are short and constant as shown in FIG. 6A can be realized. At the same time, it is another object of the present invention to provide an LED display device capable of high-luminance display with a minimum storage capacity and its control means.

[0007]

In order to achieve this object, an LED display device according to a first aspect of the present invention is a dot matrix type LED display in which a plurality of LEDs forming each dot are arranged in a dot matrix. Unit, image data receiving means for receiving image data input to be displayed on the dot matrix type LED display unit, image data selecting means for determining a transfer destination of the image data received by the image data receiving means, and image data Based on the image data stored in the plurality of image data storing means, the plurality of image data storing means storing the image data selected by the image data selecting means, and the image data stored in the plurality of image data storing means. Display drive means for driving the dot matrix type LED display unit to emit light, image data storage means and display It has a plurality of display control means for controlling the moving means, the arrangement having a.

In the LED display device according to claim 2 of the present invention, in the image data storage means according to claim 1, the image data is sequentially stored under the control of the display control means, and the stored image data is read. It has a structure that is a two-way shift register means in which the shifting direction is different depending on whether the light is transferred to the light emission driving means.

[0009]

With this configuration, even when a large-sized display device is constructed, a connection relationship can be realized in which the LED display devices are short and constant, and further, each LED display device has a full-color display capable of ensuring a sufficient lighting time. Is possible.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, an explanation will be given of the space between LED display devices in one embodiment of the present invention with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an LED display device according to an embodiment of the present invention, and FIG. 2 is a schematic operation diagram of a bidirectional shift register means in the LED display device according to the embodiment of the present invention. In FIG. 1, reference numeral 1 is an LED display device according to an embodiment of the present invention. 2 is a dot matrix type LED display unit arranged on a dot matrix, 3 is a display signal generation source (not shown) or an adjacent L
Image data receiving means for receiving input image data from the ED display device 4, 4 is image data selecting means for deciding a transfer destination of the image data received by the image data receiving means 3, 5 is image data and other adjacent LED full color Image data transmitting means for transmitting to the display device, 9a, 9b, 9p are bidirectional shift register means as a plurality of image data storing means for storing the image data selected by the image data selecting means 4, 8a, 8b, 8p are A plurality of display drive means for driving the dot matrix type LED display unit to emit light based on the image data stored in the plurality of bidirectional shift register means, and a plurality of display drive means 7a, 7b, 7p for controlling the image data storage means and the display drive means. It is a display control means.

The operation of the LED display device 1 of the embodiment of the present invention constructed as above will be described below.

First, input image data from a display signal generation source (not shown) is received by the image data receiving means 3. The received image data is sent to the image data transmitting means 5 via the image data selecting means 4 (direction X in the figure), and is also transmitted to the other adjacent LED display device 1 for the next L.
The image data is input to the ED display device 1.

On the other hand, the image data selected by the image data selecting means 4 among the image data sent to the image data transmitting means 5 via the image data selecting means 4 is shifted in two directions as image data storing means. It also becomes input data to the register means (Y direction in the figure) and is temporarily stored in the two-way shift register means 9a, 9b, 9p and the like. The stored image data is displayed by the display control means 7a, 7b, 7
It is read out by p and transferred to each display drive means 8a, 8b, 8p. As a result, each display driving unit drives each LED on the dot matrix type LED display unit 2 based on the transferred image data, for example, by controlling the light emission time.

Now, the operation of displaying a high-luminance image with the above configuration will be described in more detail with reference to FIGS. As shown in FIG. 2, the image data selected by the image data selecting means 4 (8-bit data) is 2
When the next image data is written in the direction shift register means 9a, 9b, 9p, it is sequentially shifted by 8 bits in the direction of A in the figure. This operation is repeated until there is no image data to be written. Next, when the shift operation in the direction of A in the drawing is completed, the display control means 7a, 7
The read operation is started by b and 7p, but first, by this, only the bit marked with 1 in the figure is read, and
This time, it shifts in the direction of B in the figure. Therefore, when the display control means 7a, 7b, 7p is read next, the bit marked with 2 in the figure is read.

Next, the description of the operation will be continued with reference to FIGS. 3 and 4. FIG. 3 shows the display control means 7a as described above.
7B and 7p show the image data read by 7b and 7p and the ratio of the lighting time to the data. Here, if the first read bit group is the LSB, the eighth read bit group is the MSB, and the basic lighting time is T, the LSB is the MS, which is the most significant bit.
Assuming that the data shown in FIG. 4 is sequentially read as an example of lighting for 128 T in B, as a result, the LED having the dot matrix type LED display unit arranged on the dot matrix has the time as shown in the figure. Only will be lit. As a result, since the light emission time according to the image data is provided, full color display is also possible.

Further, even if the input image data increases when a large display device is constructed, the input image data is sent to the image data transmitting means 5 via the image data selecting means 4,
From here, it is transmitted to the other LED display device 1, but only the necessary image data is transferred to the two-way shift register means 9a, 9b, 9p for storing the image data. Therefore 2
Since the time for writing to the direction shift register means is constant regardless of the number of input image data, the proportion of transfer of the image data to the display drive means 8a, 8b, 8p due to the write operation is limited. Since it is small, the unit lighting time T can be made sufficiently long.

As described above, according to this embodiment, even when a large-sized display device is constructed, a short and constant connection relationship can be realized between the LED display devices, and further, each LED display device can be sufficiently connected. A high-brightness display that can secure a long lighting time is possible.

[0019]

As described above, according to the present invention, since the LED display devices are short and constant even when a large display device is configured, a highly reliable connection can be realized.
Furthermore, since a high-luminance display is possible with the minimum storage capacity and its control means, it is possible to realize an LED display device that can exhibit excellent visibility under direct sunlight outdoors.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an LED display device according to an embodiment of the present invention.

FIG. 2 is a schematic view of the operation of the bidirectional shift register means in the LED display device according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining a display operation in the LED display device in the embodiment of the present invention.

FIG. 4 is a diagram for explaining a display operation in the LED display device according to the embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional LED display device.

FIG. 6 is a diagram showing a connection relationship when a large-sized display device is configured by using a plurality of LED display devices.

[Explanation of symbols]

 1 LED display device 2 Dot matrix type LED display unit 3 Image data receiving means 4 Image data selecting means 5 Image data transmitting means 6a, 6b, 6c Red, blue and green image memories 7a, 7b, 7c, 7p Display control means 8a, 8b, 8c, 8p Display driving means 9a, 9b, 9p Bidirectional shift register means

Claims (2)

[Claims] 1. A dot matrix type LE in which a plurality of LEDs forming each dot are arranged in a dot matrix.
D display unit, image data receiving means for receiving image data input to be displayed on the dot matrix type LED display unit, and image data selection for determining a transfer destination of the image data received by the image data receiving means Means, image data transmitting means for transmitting the image data to the other LED display device selected by the image data selecting means, a plurality of image data storing means for storing the image data, and a plurality of image data storing means A plurality of display drive means for driving the dot matrix type LED display unit to emit light based on the image data stored in the means; and a plurality of display control means for controlling the image data storage means and the display drive means. An LED display device characterized by the above. 2. The image data storage means includes a case where the image data is sequentially stored under the control of the display control means, and a case where the stored image data is read out and transferred to the display drive means. 2. The LED display device according to claim 1, wherein the LED display device is a two-way shift register means that shifts in different directions.