KR100881142B1 - LED display device - Google Patents

Abstract

An LED(Light Emitting Diode) display device for configuring various screens is provided to display freely an image of desired parts at each LED unit by connecting each LED unit in series and transmitting all the video data to each LED unit. A main controller(110) inputs data and produces video data. An image processor(200) receives the image data from the main controller through a main differential signal cable and separates and processes the image data frame by frame. A display unit(400a) is composed of N LED units(420). The display unit receives the processed image data from the image processor and displays the image data. The image processor transmits the processed image data to the first LED unit. Since the N LED units are connected in series, the N LED units transmit the processed image data sequentially. For example, the n-th LED unit transmits the processed image data to the (n+1)-th LED unit.

Description

LED display apparatus {LED display apparatus}

The present invention relates to a display device, and more particularly, to an LED display device using an LED unit composed of LED panels.

In general, display devices such as a cathode-ray tube (CRT), a liquid crystal display (LCD), or a plasma display panel (PDP) are widely used in display devices. As the demand for larger display devices increases, the display devices become larger, but there are limitations in implementing large display devices that can be used outdoors.

Accordingly, a display device, for example, an electronic signboard system, which implements an LED (Light Emitting Diode) element in a horizontal and vertical dot matrix, has been widely used in various fields. Display board systems provided indoors and outdoors, such as subway stations, airports, bus terminals, sports stadiums, and high-rise buildings, are used as display devices that provide various information such as news, broadcasting, information, advertisements, or sports relays. Such an electronic signboard system will be used in many applications and places by arranging LED elements in a dot matrix form to provide various character and figure as well as moving picture information. In particular, since full color can be realized through the commercialization of a blue LED, the range of application thereof is getting wider.

1 is a schematic diagram showing the configuration of an LED unit generally used.

Referring to FIG. 1, the LED unit 42 includes a plurality of LED modules 44 having constant horizontal and vertical pixels, such as 8 * 8 pixels or 16 * 16 pixels, to fit a desired resolution and size. . Each pixel 46 of the LED module 44 includes at least one LED element representing R (Red), G (Green), and B (Blue), respectively, to implement full color. Although the size of the LED unit 42 is not determined, it is determined by combining the LED module 44 to be individually handled, such as transport and installation.

Figure 2 is a schematic diagram showing the configuration of the LED display device according to the prior art.

Referring to FIG. 2, the LED display device 1 includes a control device such as a main controller 10, an image processing unit 20, a distribution unit 30, and a display unit 40. In the main controller unit 10, the image data is processed 12 after being sent to the image processor 20. After the processed image data is sent to the distribution unit 30 (22), it is divided into the image information corresponding to each LED unit 42 is sent to each LED unit 42. In the LED display unit 40 representing the actual information, the LED unit 42 is repeatedly arranged to match the resolution and size to be expressed. Therefore, according to the arrangement of the LED unit 42, the enlargement of the LED display unit 40 does not have a physical limit, and the LED display unit 40 may be implemented in a size of several tens to hundreds of meters or more, respectively. However, according to this, the distance between the distribution unit 30 and each of the LED units 42 becomes long, and the length of the transmission cable 50 between the distribution unit 30 and the LED unit 42 becomes long for information transmission. It has a complicated problem.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an LED display device that can process image data and efficiently transmit the image data to the LED display in order to solve the above problems in expressing image information on the LED display device. have.

In order to achieve the above technical problem, the present invention provides an LED display device as follows.

The LED display device according to the present invention is a main controller for providing the image data for the CRT, receiving the image data from the main controller unit to the main differential signal cable to separate the data for each frame and then processed to fit the LED element And a display unit including N LED units for receiving and displaying the processed image data from the image processing unit, wherein the image processing unit is the first LED unit, and the nth LED unit (1≤n≤N-1) The processed image data is transmitted to the n + 1th LED unit.

The main controller may transmit the image data in 8-bit R, G, and B signals, respectively, and the image processor may process to increase the number of bits of the R, G, and B signals of the data for each frame. .

The processed image data may be entire display image data necessary for displaying the entire display unit. Therefore, there is no need to distribute the processed image data into unit data to be displayed on each LED unit in advance.

The image processing unit, the first LED unit, the nth LED unit (1≤n≤N-1) and the n + 1th LED unit are respectively processed using the extended differential signal cable connected in series. Can be transmitted.

The image processing unit includes a differential signal receiver connected to the main controller unit and the main differential signal cable, a differential signal decoder converting image data received from the differential signal receiver into TTL data, TTL data being converted by the differential signal decoder, and the Two frame data buffers each storing TTL data immediately before conversion from the differential signal decoder, an image processing unit processing the TTL data immediately before the conversion stored in the frame data buffer, and a TTL processed by the image processing unit. A differential signal encoder for converting data into a differential signal and a differential signal transmitter for outputting the differential signal converted by the differential signal encoder.

Each of the LED units may include a unit controller. The unit controller may be displayed on the LED unit among a unit differential signal receiving unit receiving a differential signal, a unit differential signal decoder for converting a differential signal received from the unit differential signal receiving unit into TTL data, and TTL data converted by the unit differential signal decoder. Unit distribution unit for distributing unit data. An LED driver unit for driving the unit data received from the unit distribution unit to the LED unit, a unit differential signal decoder for converting TTL data converted in the unit differential signal decoder into a differential signal, and a unit differential signal decoder And a unit differential signal transmitter for outputting a differential signal, wherein the unit differential signal receiver of the first LED unit is connected to the differential signal transmitter and is a unit of the n + 1 th LED unit (1 ≦ n ≦ N-1). The differential signal receiver may be connected to the unit differential signal transmitter of the nth LED unit.

The LED unit further includes an LED unit ID storage unit for storing the ID of the LED unit, and the unit distribution unit only a portion corresponding to the LED unit ID among the TTL data converted from the unit differential signal decoder to the unit data. Can be captured.

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In the LED display device according to the present invention, each LED unit constituting the LED display unit is connected in series, so that the entire display unit image data displayed on the entire LED display unit is transferred to each LED unit. Therefore, it is possible to freely display an image of a desired portion in each LED unit. In addition, it is not necessary to distribute the image data to each LED unit in advance, and the device configuration is simplified because only the image data necessary for each LED unit can be captured and used. In addition, since the processing of the image to match the characteristics of the LED element is performed at the same time in one image processing unit, it is not necessary to separately include an apparatus for processing the image to match the characteristics of the LED element for each LED unit.

In addition, since video data is transmitted to a cable connected between adjacent LED units without transmitting image data through a separate cable to each LED unit, complicated cable configuration is not required. In particular, by transmitting the video data as a differential signal, it is resistant to external noise and can be transmitted over a long distance. In addition, the image data is not directly transmitted over a long distance, but is copied and transmitted through each LED unit, thereby further minimizing the effects of data loss and noise due to long distance transmission.

Since the screen configuration such as the aspect ratio of the LED display unit is determined by the simple arrangement of each LED unit, no change of the hardware device is required for the change of the screen configuration. Therefore, an LED display having a small vertical length and a large horizontal length having a length of several hundred meters or more can be easily implemented by simply changing image data.

Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention through the preferred embodiments. However, embodiments of the present invention illustrated below may be modified in various other forms within the scope of the same invention, and the scope of the present invention is not limited to the embodiments described below and the accompanying drawings. In the following description, when a component is described as being connected to another component, it may be directly connected to another component, and a third component may be interposed therebetween. In addition, in the drawings, the size and position of each component are exaggerated for convenience and clarity of description, and parts irrelevant to the description are omitted. Like numbers refer to like elements in the figures. On the other hand, the terms used are used only for the purpose of illustrating the present invention and are not used to limit the scope of the invention described in the meaning or claims.

3 is a schematic diagram illustrating a configuration of an LED display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the LED display apparatus 100a includes a main controller 110, an image processor 200, and an LED display 400a. The main controller 110 may include an AV device such as a DVD, a VTR, an STB (set top box), a broadcasting device, and the like, or may receive a video signal from the AV device and have stored video data. For example, the main controller unit 110 may be a computer such as a personal computer (PC). The main controller unit 110 converts the received image signal, stored image data, or processed image data into image data converted to match the resolution of the LED display unit 400a, and through the main cable 120, the image processor 200. To send. In this case, the image data transmitted from the main controller unit 110 to the image processing unit 200 may be transmitted as a differential signal.

The main controller 110 may be located adjacent to the image processor 200, but may be far away. When the distance between the main controller 110 and the image processor 200 is a long distance, the image data may be converted into an optical signal and transmitted. The main cable 120 may be, for example, a digital visual interface (DVI) cable, a low voltage differential signals (LVDS) cable, a high definition multimedia interface (HDMI) cable or an optical cable, or a cable capable of converting therebetween.

The image data transmitted from the main controller unit 110 to the image processor 200 represents a color image including R (Red), G (Green), and B (Blue) signals. The R, G, and B signals may have, for example, 6 bits, 8 bits, or 10 bits, respectively, to represent color images.

The image processing unit 200 processes the image data to fit the LED display unit 400a using the LED element because the image data is a video signal suitable for displaying on a display device using a CRT. The R, G, and B signals of the image data in the image processor 200 may increase the number of bits of each signal through such processing. For example, the image processor 200 may process the number of bits of the R, G, and B signals of the image data to be 10 bits, 12 bits, 14 bits, or more. Through this, the image data is processed to match the characteristics of the LED element, so that the image quality of the image displayed on the LED display unit 400a may be improved.

The image data processed by the image processor 200 is transmitted to the LED display unit 400a through the extension cable 250. The LED display unit 400a includes N LED units 420. The partial images displayed on the LED units 420 are summed to display the entire image on the LED display unit 400a. In this case, the processed image data is all image data to be displayed on the LED display unit 400a, that is, all image data of the display unit. Therefore, since the image data processed according to the characteristics of the LED element is transmitted to the LED display unit 400a, that is, each LED unit 420, each LED unit 420 needs to include a separate device for processing such an image. There is no.

The display unit image data transmitted from the image processing unit is transmitted to the LED display unit 400a through the first LED unit 420 (1) of the LED display unit 400a (where 420 (x) is x of N LED units). (1 ≦ x ≦ N) LED unit 420). In addition, the first LED unit 420 (1) is the second LED unit 420 (2) and the second LED unit 420 (2) is the third LED unit 420 (3). Transfer the entire video data. That is, the nth LED unit 420 (n) transmits the entire display data of the display unit to the n + 1th LED unit 420 (n + 1) (1≤n≤N-1). At this time, the nth LED unit 420 (n) and the n + 1th LED unit 420 (n + 1) are also connected through the extension cable 250 to transmit the entire image data of the display unit (1 ≦ n ≦ N -One). That is, the entire image data of the display unit transmitted from the image processing unit is serially transmitted to each LED unit 420 through the extension cable 250 connected in series. Accordingly, each LED unit 420 receives not only image data corresponding to each LED unit 420 but also image data to be displayed on the other LED unit 420.

Since the LED display unit 400a is configured according to the arrangement of the LED unit 420, the resolution and size are not limited. For example, when an LED display unit 400a representing an XGA image (resolution of 1024x768) is to be configured, 1024 horizontal pixels and 768 vertical pixel pixels are arranged. For example, when the LED unit 420 includes eight horizontal and four LED modules each having 16 pixels horizontally and vertically, the LED display unit 400a includes eight horizontally and twelve LED units 420. It can be configured by placing.

The LED pixel includes at least one LED element representing R (Red), G (Green), and B (Blue), respectively, in consideration of performance such as brightness of each LED element representing R, G, and B. A plurality of LED elements representing the same color may be included.

4 is a schematic diagram illustrating a configuration of an LED display device according to a modified embodiment of the present invention.

Referring to FIG. 4, the basic configuration of FIG. 3 is the same but there is a difference in arrangement of the LED display unit 400b. That is, the image data processed by the image processor 200 is transmitted to the first LED unit 420 (1) through the extension cable 250, and the nth LED unit 420 (n) is the n + 1th LED unit ( 420 (n + 1) transmits the processed image data through the connected extension cable 250 to the same point (1 ≦ n ≦ N−1).

In this case, the LED display unit 400b has a horizontally long form, unlike general image information having a 4: 3 ratio and a 16: 9 ratio. The LED display unit 400b configured as described above can be used, for example, in an advertisement display board surrounding a ground of an athletic stadium. For example, the LED display unit 400b may be arranged so that 3000 pieces are connected horizontally. If the width of the LED unit 420 is, for example, 320 mm, the width of the LED display unit 400b may be approximately 1 km. However, since the extension cable 250 is connected between the nth LED unit 420 (n) and the n + 1th LED unit 420 (n + 1), respectively (1≤n≤N-1), the extension cable 250 In this case, the main controller unit 110 forms the image data to match the arrangement of the LED unit 420 in the LED display unit 400b.

5 is a schematic diagram illustrating a configuration of an image processor according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the image processor 200 is connected to the main controller 110 and the main cable 120 to receive image data. The image processor 200 includes a differential signal receiver 212 to which the main cable 120 is connected, and a differential signal decoder 210 to convert the image data received by the differential signal receiver 212. The image data transmitted as the differential signal from the main controller unit 110 is converted into TTL (Transistor Transistor Logic) data in the differential signal decoder 210 so that the data can be separated and processed into frame-specific data. TTL data of the frame being converted and TTL data of the immediately converted frame are alternately stored in two frame data buffers 220, respectively. Various image processing may be performed on the TTL data of the frame converted immediately before the image so that the image processing unit 230 fits the LED display unit 400a or 400b.

As image processing is performed in the image processing unit 230, the number of bits of the R, G, and B signals originally owned by the TTL data of the immediately converted frame may be increased. For example, when the R, G, and B signals of the image data transmitted by the image processor 200 are 8 bits, respectively, the image processor 230 may determine the number of bits of the R, G, and B signals through image processing. It can be processed to be 10 bits, 12 bits, 14 bits or more, respectively.

The image data processed by the image processor 230 is converted by the differential signal encoder 240 into a differential signal and transmitted through the differential signal transmitter 242. That is, the differential signal transmitter 242 is connected to the LED display unit 400a or 400b, specifically, the first LED unit 420 (1) in the LED display unit 400a or 400b through the extension cable 250, and then processed. Send the video data.

6 is a schematic diagram showing the configuration of an LED unit according to an embodiment of the present invention.

Referring to FIG. 6, the LED units 420 may each include a unit controller 500. The unit controller 500 receives a differential signal from the differential signal transmitter 242 of the image processor 200 or the differential signal transmitter 542 of the other LED unit 420 through the extension cable 250. The signal receiver 512 and a unit differential signal decoder 510 for converting the received differential signal into data for each frame are converted into TTL data so as to be processed. That is, the unit differential signal receiver 512 of the first LED unit 420 (1) is connected to the differential signal transmitter 242 of the image processor 200 and the n + 1 th LED unit 420 (n + 1). Unit differential signal receiving unit 512 of the n) LED unit 420 (n) receives a differential signal, which is image data processed by being connected to the unit differential signal transmitting unit 542 of the nth LED unit 420 (n) through an extension cable 250 ( 1 ≦ n ≦ N-1).

The TTL data of the frame being converted by the unit differential signal decoder 510 and the TTL data of the immediately converted frame may be alternately stored in the two unit frame data buffers 620, respectively. The TTL data of the frame immediately converted is captured by the unit distribution unit 520 and only the unit data to be displayed on each LED unit 420 is transferred to the LED driver unit 530. In addition, the TTL data of the immediately converted frame is converted into a differential signal by the unit differential signal encoder 540 and transmitted to the unit differential signal transmitter 542 and another LED unit 420 connected through the extension cable 250.

Therefore, the processed image data is transmitted to the adjacent LED unit 420 and then replicated and transferred to another adjacent LED unit 420, thereby reducing the problem of noise or data loss due to long distance transmission.

That is, the unit differential signal receiving unit 512 and the unit differential signal transmitting unit receive and then transmit the processed image data, which is the entire image data of the display unit to be displayed on the LED display units 400a or 400b, and include each LED unit 420. In the unit distribution unit 520, only the unit data corresponding to each LED unit 420 is captured and displayed on the corresponding LED unit 420. Therefore, the processed image data, which is the entire image data of the display unit, is repeatedly transmitted from the image processing unit 200 to the Nth LED unit 420 (N). Therefore, it is not necessary to distribute the image data corresponding to each LED unit 420 in advance and transmit them separately, and each LED unit 420 receives all the image data of the display unit.

As described above, each LED unit 420 includes a unit controller 500 for copying and transmitting the processed image data, and capturing and distributing a portion required for the corresponding LED unit 420. It can be configured simply because it can not include the device to be processed to fit.

Each LED unit 420 may include a unit ID storage unit 610. In this case, the unit distribution unit 520 captures unit data which is an image of a portion to be displayed on the corresponding LED unit 420 according to the ID of each LED unit stored in the unit ID storage unit 610. The unit ID storage unit 610 may store the ID of the corresponding LED unit 420 using a memory element, or may store the ID of the corresponding LED unit 420 using a dip switch.

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The LED driver 530 drives the individual LED pixels included in the LED unit 420, specifically, the LED elements (not shown) included in the individual LED pixels with the transferred unit data to display an image. The LED driver 530 may include the number of LED driver elements required to drive the LED elements included in the LED unit 420. For example, if 48 LED driver elements are required to drive an LED module composed of 16 * 16 pixels, the LED driver 530 corresponds to 48 times the number of LED modules included in the corresponding LED unit 420. LED driver element is included.

1 is a schematic diagram showing the configuration of an LED unit generally used.

Figure 2 is a schematic diagram showing the configuration of the LED display device according to the prior art.

3 and 4 are schematic views showing the configuration of the LED display device according to the embodiment of the present invention and its modification, respectively.

5 is a schematic diagram illustrating a configuration of an image processor according to an exemplary embodiment of the present invention.

6 is a schematic diagram showing the configuration of an LED unit according to an embodiment of the present invention.

<Description of main parts of drawing>

100a, 100b: LED display device, 110: main controller, 120: main cable, 200: image processing unit, 210 differential signal decoder, 212: differential signal receiver, 220: frame data buffer, 230: image processing unit, 240: Differential signal encoder, 242: differential signal transmitter, 250: extension cable, 400a, 400b: image display, 420: LED unit, 500: unit controller, 510: unit differential signal decoder, 512: unit differential signal receiver, 520: unit Allocation, 530: LED driver unit, 540: unit differential signal encoder, 542: unit differential signal transmitter, 610: unit ID storage unit, 620: unit frame data buffer

Claims (10)

Main controller unit for providing the image data which is a video signal for CRT, The image processor receives the image data from the main controller by a main differential signal cable, divides the image data into frame-specific data, and processes the image data to fit the LED elements, thereby increasing the number of bits of the R, G, and B signals of the frame-specific data. And Including a display unit consisting of N LED unit for receiving and displaying the processed image data from the image processing unit, The image processing unit transmits the processed image data using an extended differential signal cable connected in series to the first LED unit and the nth LED unit (1≤n≤N-1) to the n + 1th LED unit, respectively. , The processed image data is display unit whole image data necessary for displaying the entire display unit. The image processing unit includes a differential signal receiver connected to the main controller unit and the main differential signal cable, a differential signal decoder converting image data received from the differential signal receiver into TTL data, TTL data being converted by the differential signal decoder, and the Two frame data buffers each storing TTL data immediately before conversion from the differential signal decoder, an image processing unit processing the TTL data immediately before the conversion stored in the frame data buffer, and a TTL processed by the image processing unit. A differential signal encoder for converting data into a differential signal and a differential signal transmitter for outputting a differential signal converted by the differential signal encoder, The LED unit includes a unit controller and a unit ID storage unit for storing the unit ID of the LED unit, respectively, The unit controller may include a unit differential signal receiver that receives a differential signal through the extended differential signal cable, a unit differential signal decoder that converts a differential signal received from the unit differential signal receiver into TTL data, and TTL data converted by the unit differential signal decoder. A unit distribution unit for distributing unit data to be displayed on the LED unit, an LED driver unit for driving the unit data received from the unit distribution unit to the LED unit, and TTL data converted by the unit differential signal decoder as a differential signal. A unit differential signal encoder for converting and a unit differential signal transmitter for outputting a converted differential signal from the unit differential signal encoder, And the unit distribution unit captures only a portion corresponding to the unit ID of the TTL data converted by the unit differential signal decoder into the unit data. delete delete delete delete delete delete delete delete delete

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