JP2000221934A - Led display device and control method thereof using the same - Google Patents

Abstract

An object of the present invention is to provide an LED display device in which a light emitting diode is connected to a plurality of LED units arranged in a desired shape and can be implemented efficiently and maintenance-free. It is in. The present invention relates to an LED having an LED control device for transferring data for controlling lighting of a light emitting diode, and a plurality of LED units connected in series by a control bus for sequentially transferring data from the LED control device. A display device. In particular, the LED unit has an identification information providing unit that converts the identification information transferred by the control bus into different identification information based on a certain function, and a storage unit that stores individual identification information for each LED unit. A display device. It is.

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 in which light-emitting diodes are electrically connected to a plurality of LED units arranged in a desired shape and which can perform communication efficiently and maintenance-free. Related to the device.

[0002]

2. Description of the Related Art Today, light emitting diodes capable of emitting light with an ultra-high luminance of over 1000 mcd are known as RGB (red, green, blue).
Each was developed separately. Along with this, the installation of large LED displays and the like that can be used outdoors as one type of LED display devices has begun to increase sharply by taking advantage of the features of lightness, thinness, and low power consumption.

An LED display is constructed as one screen by combining a plurality of LED units according to the installation location. Each LED unit has RGB on the board
Are arranged in a dot matrix. Further, a driving circuit capable of individually driving each light emitting diode is provided. In the LED display, an LED control device for transferring display data and a plurality of LED units are connected in a one-to-many relationship. The larger the LED display, the larger the number of connected LED units. For example, an LED display may be configured by combining LED units of 300 units vertically × 400 units horizontally.

Meanwhile, the LED display is operated in each LED unit based on transfer data such as display data, luminance correction data, and various control data transferred from the LED control device, processes respective image data, and emits each light. The lighting of the diode is controlled so as to have a desired luminance. The lighting of each light emitting diode can be displayed as a desired image or the like on the entire LED display. Therefore, the data transferred from the control device needs to determine which data is to be provided to which LED unit. Therefore, each LED unit has another LED
It is necessary to hold identification information for identifying a difference from a unit.

[0005]

SUMMARY OF THE INVENTION However, LEDs
The displays are usually L
ED units are individually combined and configured. In addition, there are various connection methods and forms. Further, the LED display is often reassembled for maintenance or the like. Therefore, it is extremely difficult to make each LED unit recognize individual identification information in advance and assemble them in order. Therefore, once all LED units are assembled to form an LED display,
At present, it is supported by separately assigning identification information to each ED unit. Specifically, storage means for constantly storing and holding identification information is provided in a drive circuit provided on the back surface of the LED unit, and the identification information of each LED unit is set by switching a dip switch or the like for each LED unit. Has changed. By changing the bit pattern of each LED unit, identification information is added to data transferred from the LED control device, and it is determined which LED unit displays a desired image pattern.

For this reason, after assembling the LED display, the identification information of each LED unit must be manually assigned one by one in order, which is one of the extremely complicated and time-consuming operations. In particular, at the present time when the size of the LED display increases and the number of LED units increases, or the number of LED units that combine irregularly increases due to restrictions on the installation location, the efficiency of work efficiency is particularly required.

Therefore, according to the present invention, the above-mentioned identification information for each LED unit is collectively provided to each LED unit constituting the LED display by using a cable for transmitting image data, thereby ensuring safety and work efficiency. An object of the present invention is to provide a significantly superior LED display.

[0008]

SUMMARY OF THE INVENTION The present invention provides an LED control device for transferring data for controlling the lighting of a light emitting diode,
An LED display device having a plurality of LED units connected in series by a control bus for sequentially transferring data from the LED control device. In particular, the LED unit is provided with identification information providing means for converting the identification information transferred by the control bus into different identification information based on a certain function,
Storage means for storing individual identification information for each unit. Thus, an LED that can provide individual identification information for each LED unit with a relatively simple configuration
It can be a display device.

In the LED display device according to the second aspect of the present invention, the control bus is a serial bus or a parallel bus. Thus, a relatively simple configuration can be achieved even when a large-sized LED display device is configured using a display data transfer bus.

In the LED display device according to the third aspect of the present invention, the identification information storage means for storing the transferred identification information or the identification information converted by the identification information providing means is a temporary storage means. This makes it possible to easily re-assign identification information when desired, such as when inspecting or reassembling the LED display device.

According to a fourth aspect of the present invention, there is provided a method for controlling an LED display device, comprising: an LED control device for transferring control data for controlling the lighting of the light emitting diode by the LED display device;
A plurality of LED units connected to transfer control data from the ED control device. In particular, the LED control device transfers control information for switching between the control bus and the internal bus to all LED units. Then, transferring and storing the initial identification information to the first LED unit connected to the LED control device; and keeping the initial identification information constant from the first LED unit to the second LED unit connected next. Transferring and storing the second identification information converted based on the function of the second LED unit, and transmitting the second identification information from the second LED unit to the next connected third LED unit based on the function. Transferring and storing the converted third identification information, and transferring the (n + 1) th identification information converted from the nth LED unit to the (n + 1) th LED unit connected next based on the function. LE for allocating identification information of a plurality of LED units connected to an LED control device by transferring and storing identification information
It is a control method of a D display device. This makes it possible to relatively easily assign identification information to each LED unit constituting the LED display device.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have obtained L
By using the control bus for data transfer provided between the ED units, each L
The inventors have found that identification information can be assigned to each ED unit, and have accomplished the present invention.

That is, a command for controlling the LED units is sent from the LED control device using a control bus having a data communication function provided between the LED units. Thus, individual identification information different from other LED units is recognized and stored for each LED unit.
By using the identification information, it is possible to individually receive the display data, the luminance correction data, and the various control data transferred to each LED unit and control the lighting. Therefore, the LED display can be configured without being affected by the installation location, the installation configuration, and the like of each LED unit. Always change the identification information stored in the storage means,
A large display can be configured without manual operation.

Hereinafter, an example of the present invention will be described in detail. FIG. 1 shows a schematic block diagram of an LED display according to an embodiment of the present invention. A plurality of LED units are electrically connected to an LED control device that controls display data transfer and the like of the entire LED display.
As the LED display, each LED unit is arranged in a matrix or the like, and a display surface having a desired shape is configured as a whole. The LED control device and the LED units or the LED units are connected in series by a control bus. The LED unit includes a control unit that changes the received identification information value using a predetermined algorithm. Also provided is an identification information storage means for storing identification information values processed by the control unit and made individual values for each LED unit.

A control command for switching the output stage selector to the internal bus side is issued from the LED control device to all the LED units in advance. Next, the initial identification information is transferred from the LED control device to the first-stage LED unit via the control bus. At this time, the identification information is changed by a predetermined algorithm and transferred to the next connected LED unit. The received identification information is stored in the identification information storage means in the LED unit as its own identification information. Next memorized LED
The unit repeats the same operation to sequentially store different identification information for all the LED units in the internal storage means. After the identification information has been assigned to all the LED units, the control bus switches the output stage selector as a control bus for transferring normal display data.
Hereinafter, each configuration of the present invention will be described in detail.

(LED Control Device) The LED control device transmits video data and control data for controlling each LED unit to L.
This is transferred to the ED unit side. Therefore, it can be configured independently of the video source or can be configured integrally. For example, when the video data from a video device, a DVD device, or the like is configured independently and used, the video data is received by the control means using the device itself as a video source, and AD (analog to digital) conversion is performed. After the conversion, the control device can transfer it as RGB digital data. On the other hand, when the video source for outputting digital data and the control means are integrally formed, the digital data can be directly transmitted to the LED unit side.

(LED Unit) The LED unit is a light emitting diode, driving means for driving the light emitting diode,
The present invention can be configured by an identification information providing unit, an identification information storage unit, a comparison unit, and the like particularly provided for the present invention. These various means can be constituted by utilizing a semiconductor memory, a logic circuit and a central processing unit.

An LED display can be constructed by combining such LED units with LED units of various sizes or a plurality of LED units depending on the size of the screen. Similarly, if the screen is relatively large, LED
LED display with multiple units in one LE
It is configured as a D module. An LED display can be configured by collecting a plurality of the LED modules.

(Light Emitting Diode) The light emitting diode used in the LED unit can be formed by using two or more pieces such as a dot matrix. When used for an LED display capable of full-color display, for example, it can be configured by arranging light-emitting diodes capable of emitting light of RGB as a single pixel in a 16 × 16 matrix.

Light emitting diodes are GaP, GaAs, G
aN, InN, AlN, GaAsP, GaAlAs, I
nGaN, AlGaN, AlGaInP, InGaAl
A material in which a semiconductor material such as N is used for the light-emitting layer is used. The structure of the semiconductor element is MIS junction, PIN junction or pn
Examples include a homo-structure, hetero-structure or double-hetero structure having a junction.

The emission wavelength can be variously selected from ultraviolet to infrared light depending on the semiconductor material and its mixed crystal ratio. Furthermore, a single quantum well structure or a multiple quantum well structure in which the light emitting layer is a thin film having a quantum effect can be used.

In addition to the three primary colors of RGB, BG (blue-green)
For example, a light emitting diode having a complementary color relationship with light emitted from the light emitting diode, such as R and R (red), or a light emitting diode formed by a combination of light from an LED chip and a fluorescent substance excited and emitted by the light emitting diode can be used. When a fluorescent substance is used, a light-emitting diode capable of emitting white light with good linearity can be obtained by using one kind of light-emitting element by using a fluorescent substance that is excited by light from the light-emitting diode and converts to a long wavelength. .

Light emitting diodes of various shapes can be used. Specifically, an LED that is a light emitting element
Examples include a chip-type LED, a chip-type LED, and a light-emitting element itself in which a chip is electrically connected to a lead terminal using a wire or a conductive paste and is covered with a mold resin or the like.

(Driving Means) The driving means is capable of supplying power to the light emitting diodes and driving only the desired light emitting diodes. Specifically, there is a device driven by static driving or dynamic driving. When LEDs arranged in a dot matrix are dynamically driven, a desired emission color can be obtained by selecting and controlling the LED group arranged in each segment at a fixed cycle by a common driver and adjusting the time of current flow by the segment driver. Can be.

(Identification Information Assigning Means) The identification information assigning means calculates and assigns identification information for each LED unit. The identification information value from the LED unit or the LED controller directly above the control unit connected by the control bus is changed by a desired function such as addition one by one by a processing block provided inside the LED unit. The processing block used for the operation of the identification information uses various algorithms as long as individual identification information can be given to each LED unit in addition to simple addition and subtraction to the information given in advance using a central processing unit or the like. Can be.

(Identification information storage means) The identification information storage means provided in the LED unit stores identification information for distinguishing each LED unit. Such a storage means is a register which is a temporary storage memory, a RAM,
It can be configured by utilizing various semiconductor memories. For each piece of identification information, a setting instruction and setting data of the identification information are transferred from the control means to all the LED units, and the output stage selector is switched to the internal bus. Subsequently, individual ID information can be obtained by repeating the operation of incrementing the value of the ID information from the first LED unit by one and transferring the value to the next LED unit. By sequentially incrementing the identification value, it is possible to automatically assign identification information by control from the control unit without assigning a unit ID by providing a permanent storage unit such as a dip switch for each LED unit.

(Comparison means) After obtaining the individual identification information, the LED unit autonomously switches the output stage selector to the control bus side and compares the transferred data with the identification information of each LED unit by the comparison means. Only the information of the own LED unit can be captured. The comparison means is L
Identification information of data transferred from the ED controller and each LE
The identification information is compared with the identification information stored in the storage unit of the D unit. As a result of the comparison, if they match, the data is selectively received as data of its own LED unit, and can be constituted by a comparison circuit such as an exclusive OR or a central processing unit. Hereinafter, specific examples of the present invention will be described in detail, but it is needless to say that the present invention is not limited thereto.

[0028]

(Embodiment 1) One pixel is constituted by a light emitting diode capable of emitting light of each of RGB as an LED unit. Light emitting diodes of one set of RGB are arranged in a 16 × 16 dot matrix on a substrate.

The driving circuit includes a driving unit for dynamically driving each light emitting diode, a register as a temporary storage memory as a storage unit for temporarily storing the transferred data, and a driving circuit for each light emitting diode based on the received data. A computing means for computing the amount of current to be supplied and the pulse width, and connecting the control device and the LED unit as a control bus,
A control unit for controlling communication of the D unit is provided.

In particular, according to the present invention, M as an arithmetic means for adding 1 to the input identification information value (ID = "00")
A PU and a register as a temporary memory as identification information storage means are provided.

The LED control means has an output stage selector for switching data output for selectively processing identification information separately from normal display data using a control bus. The data switching means is constituted by a selector circuit for switching between a control bus and an internal bus at an output stage in each LED unit, and switching control of the selector circuit is performed by sending control information from a control device. As shown in FIG. 1, each LED unit having the above configuration is connected between the control device or the LED units by a control bus. The control bus may be a parallel bus or a serial bus. Similarly, it can be performed by wireless communication means using infrared communication.

Next, the identification information providing method of the present invention will be described. FIG. 2 shows the state of the output stage selector before setting the identification information or during normal operation. After the power is turned on, the initial identification information stored in the identification information storage means of each LED unit is, for example, ID = "" as identification information common to all LED units.
0 ". At this time, the output stage selector is operated to be on the control bus side (" A "side in the figure). That is, the control device uses identification information common to all LED units,
It becomes possible to control all LED units at once. In this state, a control command for switching the output stage selector from A to B is issued to all the LED units. Then, the output data of each LED unit can transfer control information from the control unit in each LED unit to the next LED unit via the internal bus. The state is shown in FIG. 3 (the thick line with an arrow indicates the flow of data).

The output stage selector is connected to the internal bus side ("B" in the figure).
Side), the control device further initializes the identification information,
That is, the value of the identification information of the first LED unit connected to the control device is transferred to the first LED unit. The first LED unit transfers a value obtained by adding 1 to the value of the initial identification information to the next-stage LED unit. Next LE
The D unit accumulates the received identification information in its own temporary storage memory, and transfers it to the next LED unit as a value obtained by adding 1 to the value of the identification information received by the next LED unit. As described above, the arithmetic processing is performed on the value of the identification information received by the predetermined algorithm such as adding 1 to the predetermined value (addition in this case). The information before the operation processing may be used as the identification information of the own LED unit, and the information after the operation processing may be used as the identification information of the own LED unit. By performing these receiving processes up to the LED unit at the last stage, the identification information of the LED unit is automatically set autonomously. After each LED unit stores its own identification information in the temporary storage memory and transfers the calculated identification information to the next LED unit, the LED unit that completes the transfer autonomously sets the output stage selector to the control bus side (in the figure). A "
2), and returns to the state of FIG.

As described above, in all the LED units,
After the individual identification information is set, the individual LED units can be individually controlled via a control bus from a normal control device, and desired image data and the like can be displayed.

[0035]

According to the LED display device of the present invention, each LED is individually controlled manually by the control of the LED control device.
The identification information after each LED unit can be automatically assigned with a very simple configuration without assigning identification information for each ED unit. Therefore, the identification information can be automatically given regardless of the size of the LED display screen, or even when the LED display is reassembled. In addition, a circuit for constantly storing identification information is not required, and the circuit configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic circuit block diagram of an LED display device according to the present invention.

FIG. 2 is a schematic circuit block diagram showing a flow of display data when the LED display device of the present invention is driven for lighting.

FIG. 3 is a schematic circuit block diagram showing a flow of identification data when the identification information is provided in the LED display device of the present invention.

[Explanation of symbols]

 Reference Signs List 101 ... Control device 102 ... Internal circuit of LED unit 103 ... Control unit 104 ... Output stage selector 105 ... Identification information storage means 200 ... Shows the flow of data such as display data 300 ... Indicates the flow of data such as identification information.

Claims (4)

[Claims] 1. An LED display device comprising: an LED control device for transferring data for controlling lighting of a light emitting diode; and a plurality of LED units connected in series by a control bus for sequentially transferring data from the LED control device. Wherein the LED unit converts identification information transferred by the control bus into different identification information based on a certain function, and storage means for storing individual identification information for each LED unit. An LED display device comprising: 2. The LED display device according to claim 1, wherein said control bus is a serial bus or a parallel bus. 3. The LE according to claim 1, wherein the identification information storage unit is a temporary storage unit that stores the transferred identification information or the identification information converted by the identification information providing unit.
D display device. 4. An LED display having an LED control device for transferring control data for controlling lighting of a light emitting diode, and a plurality of LED units electrically connected to transfer control data from the LED control device. A method for controlling a device, comprising: transferring control information for switching between a control bus and an internal bus from the LED control device to a first LED unit connected to the LED control device; and after switching to the internal bus, Transferring the initial identification information and causing the first LED unit to store the identification information; and connecting the second LED connected from the first LED unit to the second LED.
The initial identification information or the second identification information obtained by converting the initial identification information based on a certain function is transferred to the ED unit, and the received initial identification information is stored as the second identification information based on the certain function. Alternatively, a second step of storing the transferred second identification information, and an (n + 1) th L connected next from the nth LED unit
The n-th identification information or the (n + 1) -th identification information obtained by converting the n-th identification information based on the function is transferred to the ED unit, and the received n-th identification information is converted into the (n + 1) -th identification information based on a certain function. An LED that stores identification information or allocates identification information to a plurality of LED units connected to an LED control device in an (n + 1) th step of storing the transferred (n + 1) th identification information.
A method for controlling a display device.