JP2010199428A - Led unit and display device using the same - Google Patents

Abstract

An LED unit that suppresses a magnetic field generated around a circuit component and reduces adverse effects of electromagnetic waves to the outside, and a display device using the LED unit are provided.
The present invention provides an LED unit having a driver IC for sequentially transmitting data signals from an LED control device, and the driver IC is connected to a first signal line for transmitting the data signal. In addition, each of the dummy terminals has a dummy terminal in the vicinity of the input terminal and the output terminal, and each dummy terminal is substantially parallel to the first signal line. A second signal line for transmitting an inverted data signal that is disposed and has an opposite phase to the data signal is connected.
[Selection] Figure 1

Description

  The present invention relates to an LED unit that displays an image or a character by controlling lighting of a light emitting diode (LED), and a display device using the LED unit, and in particular, an LED that can reduce adverse effects due to external electromagnetic waves. The present invention relates to a unit and a display device using the unit.

  In recent years, malfunctions of electronic devices due to electromagnetic waves, interference with wireless communication, and the like have become problems, and various countermeasures have been taken for LED display devices such as large displays and road information display boards. For example, an LED display device has been proposed in which a printed wiring board on which LED lamps and circuit components are mounted is covered with a metal case, thereby suppressing leakage of electromagnetic waves generated around the circuit components to the outside (Patent Document 1). reference).

JP 2001-242895 A

However, since such an LED display device has a connector connected to the outside on the back side of the printed wiring board, there is a limit in covering the entire outside with a metal case. For this reason, circuit components (for example, driver ICs) are exposed to the outside, and electromagnetic waves generated around the circuit components are still insufficient to prevent leakage to the outside.
Accordingly, the present invention has been made in view of such circumstances, and an LED unit capable of suppressing the magnetic field itself generated around the circuit components and reducing the adverse effects of electromagnetic waves to the outside, and a display device using the same The purpose is to provide.

  According to the present invention, the above problem is solved by the following means.

  The LED unit of the present invention is an LED unit having a driver IC that sequentially transmits data signals from the LED control device, and the driver IC is connected to a first signal line for transmitting the data signal. An input terminal and an output terminal are provided, and dummy terminals are provided in the vicinity of the input terminal and the output terminal, respectively, and each dummy terminal is disposed substantially parallel to the first signal line. And a second signal line for transmitting an inverted data signal having a phase opposite to that of the data signal is connected. Thereby, the magnetic field itself generated around the circuit component can be suppressed, and the adverse effect of the electromagnetic wave to the outside can be reduced.

Further, the width of the input terminal and the output terminal is substantially the same as the width of the first signal line when viewed from the upper surface side of the driver IC, and the width of the dummy terminal is the same as that of the driver IC. It is preferable that the width of the second signal line is substantially the same as viewed from the upper surface side. Thereby, generation | occurrence | production of electromagnetic waves can be suppressed also in the connection part vicinity of each terminal and each signal wire | line.
The data signal and the inverted data signal preferably have the same absolute value of charge / discharge current. As a result, the magnetic fields generated by the data signal and the inverted data signal cancel each other with high accuracy, and the generation of electromagnetic waves can be further reduced.

  The display device of the present invention includes a plurality of the LED units, and the plurality of LED units are connected in series from the LED control device via the driver IC, and the LED control device and the driver IC And the adjacent driver ICs are connected by the first signal line and the second signal line, and the first signal line and the second signal line are respectively connected with the data. A signal and the inverted data signal are input from the LED control device. Thereby, the magnetic field itself generated around the circuit component can be suppressed, and a display device in which the adverse effect of the electromagnetic wave to the outside is reduced can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the LED unit which suppressed the magnetic field which generate | occur | produces around a circuit component and reduced the bad influence of the electromagnetic waves to the outside, and a display apparatus using the same can be provided.

It is an enlarged block diagram which shows typically the driver IC of the LED unit which concerns on 1st embodiment. 3 is a timing chart schematically showing waveforms of a data signal and an inverted data signal according to the first embodiment. It is a block diagram which shows typically the connection relation of the LED control apparatus and LED unit which concern on 1st embodiment. It is a block diagram which shows typically the display apparatus which concerns on 1st embodiment. It is a block diagram which shows typically the connection relation of the LED control apparatus which concerns on Example 1, and an LED unit. It is a block diagram which shows typically the connection relation of the LED control apparatus which concerns on Example 2, and an LED unit.

  Hereinafter, embodiments of an LED unit according to the present invention and a display device using the LED unit will be described in detail.

  Moreover, this specification does not specify the member shown by the claim as the member of embodiment. The dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention only, unless otherwise specified, and are merely illustrative examples. Only. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same name and reference sign indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.

<First embodiment>
FIG. 1 is an enlarged configuration diagram schematically showing a driver IC of the LED unit according to the first embodiment. FIG. 2 is a timing chart schematically showing waveforms of the data signal and the inverted data signal according to the first embodiment. FIG. 3 is a configuration diagram schematically showing a connection relationship between the LED control device and the LED unit according to the first embodiment. FIG. 4 is a configuration diagram schematically showing the display device according to the first embodiment.

  The LED unit 100 according to the first embodiment includes a driver IC 10 that sequentially transmits a data signal (A) from the LED control device 30. The driver IC 10 has an input terminal 12 and an output terminal 14 to which a first signal line 20 for transmitting a data signal (A) is connected, and a dummy is provided near the input terminal 12 and the output terminal 14. Terminals 16 and 18 are provided. A second signal for transmitting an inverted data signal (B) that is disposed substantially parallel to the first signal line 20 and that has an opposite phase to the data signal (A) is provided at each of the dummy terminals 16 and 18. Line 22 is connected. At this time, the dummy terminals 16 and 18 are preferably arranged so as to be substantially parallel to the input terminal 12 and the output terminal 14, respectively.

  In particular, as shown in FIGS. 1 and 2, the driver IC 10 according to the present embodiment receives the data signal (A) from the input terminal 12 to which the first signal line 20 is connected, and is provided in the LED unit 100. The lighting operation of the light emitting diode (not shown) is started. Further, the input data signal (A) is directly transmitted through the wiring inside the driver IC and output from the output terminal 14. The first signal line 20 is connected to the output terminal 14 similarly to the input terminal 12, and the output data signal (A) is sequentially transmitted to the next adjacent driver IC 10. In addition, dummy terminals 16 and 18 are arranged in the vicinity of the input terminal 12 and the output terminal 14 so as to be substantially parallel to each other. Specifically, a dummy input terminal 16 is provided near the input terminal 12, and a dummy output terminal 18 is provided near the output terminal 14. The dummy input terminal 16 is connected to a second signal line 22 arranged substantially parallel to the first signal line 20 connected to the input terminal 12. Further, in the same manner, the second signal line 22 is connected to the dummy output terminal 18 so as to be substantially parallel to the first signal line 20 connected to the output terminal 14. An inverted data signal (B) having a phase opposite to that of the data signal (A) transmitted to the first signal line 20 is transmitted to the second signal line 22. The inverted data signal (B) is input from the dummy input terminal 16 to which the second signal line 22 is connected, and further output from the dummy output terminal 18 through the wiring inside the driver IC. A second signal line 22 is connected to the dummy output terminal 18, and the output inverted data signal (B) is sequentially transmitted to the next driver IC 10 adjacent thereto. At this time, it is preferable that the data signal (A) and the inverted data signal (B) are set so that the absolute values of the charge / discharge currents are equal to each other. That is, load capacitances such as the input terminal 12 and output terminal 14 of the driver IC to which the data signal (A) is transmitted and the first signal line 20 and a dummy input terminal of the driver IC to which the inverted data signal (B) is transmitted. 16 and the dummy output terminal 18 and the load capacity of the second signal line 22 and the like are preferably substantially the same. Thereby, the magnetic fields generated by the data signal (A) and the inverted data signal (B) cancel each other with high accuracy, and the generation of electromagnetic waves can be further reduced. The width of each terminal 12, 14, 16, 18 of the driver IC is preferably substantially the same as that of each signal line 20, 22 to be connected. Specifically, as viewed from the upper surface side of the driver IC 10, the width of the input terminal 12 and the output terminal 14 is substantially the same as the width of the first signal line 20, and the dummy input terminal 16 and the dummy output terminal 18. The width of the second signal line 22 is preferably substantially the same as the width of the second signal line 22. As a result, even in the vicinity of the connection portion between each terminal 12, 14, 16, 18 and each signal line 20, 22, substantially the same parallel as the positional relationship between the first signal line 20 and the second signal line 22 is maintained. The generation of electromagnetic waves can be further suppressed. Furthermore, it is preferable that the wiring inside the driver IC is also provided substantially in parallel so that the positional relationship between the first signal line 20 and the second signal line 22 is maintained.

  Further, the LED unit 100 having the driver IC 10 according to the first embodiment can be a display device by being connected in a plurality of stages as shown in FIGS. 3 and 4. Specifically, a plurality of LED units 100 according to the present embodiment are provided, and the plurality of LED units 100 are connected in series from the LED control device 30 via the driver IC 10 to constitute a display device. At this time, the first signal line 20 and the second signal line 22 are provided between the LED control device 30 and the driver IC 10 and between the adjacent driver ICs 10 (particularly, between the driver ICs of the adjacent LED units 100). Connected with. Further, the data signal (A) and the inverted data signal (B) are input from the LED control device 30 to the first signal line 20 and the second signal line 22, respectively.

  Therefore, the LED unit according to the first embodiment and the display device using the LED unit can always maintain the inverted data signal (B) adjacent to the data signal (A). The magnetic field generated by (A) can be canceled with high accuracy by the magnetic field of the inverted data signal (B). For this reason, in this embodiment, the LED unit which suppressed the magnetic field which generate | occur | produces around circuit components and reduced the bad influence of the electromagnetic waves to the outside, and a display apparatus using the same can be provided.

  Hereinafter, each structure of embodiment which concerns on this invention is explained in full detail.

(LED control device)
In addition to supplying a data signal indicating a lighting pattern such as video and characters to an LED unit in which a plurality of light emitting diodes are arranged in a matrix, the LED control device also displays and lights correctly in response to the data signal. It is a device that can supply various control signals for controlling the ON / OFF timing and output of the light emitting diode. In addition, in the LED control device according to the present embodiment, an inverted data signal having an opposite phase to the data signal can be supplied in addition to the signals. For this reason, the LED control device is connected to the first signal line for transmitting the data signal, and is also arranged substantially in parallel to the first signal line and transmits the inverted data signal. Lines are at least connected. Further, the first signal line and the second signal line connected to the LED control device extend to and connect to a driver IC (particularly, an input terminal and a dummy input terminal) mounted inside the LED unit.
Also, the LED control device can supply signals having opposite phases to various control signals, and is supplied by signal lines arranged substantially in parallel with signal lines through which the various control signals are transmitted. Is preferred.

(LED unit)
The LED unit includes at least light emitting diodes arranged in a matrix and a driver IC that drives the light emitting diodes. The LED unit can constitute a display device by combining LED units of various sizes or a plurality of LED units depending on the required screen size.

(Light emitting diode)
As the light emitting diode, any of those used in the art can be used. For example, a shell type formed by molding a light emitting element disposed on a lead electrode with a covering member such as glass or resin, or a surface mount type (SMD) in which a light emitting element is disposed on a package formed of ceramic or resin. ). Further, when used in an LED unit capable of full color display, it can be configured by arranging light emitting diodes capable of emitting RGB (red, green, and blue), respectively, and arranging them in a matrix as one pixel.

(Driver IC)
The driver IC is for driving the light emitting diode. A plurality of driver ICs may be provided for one LED unit depending on the type and number of light-emitting diodes used in the LED unit, and may be equally disposed throughout the LED unit in consideration of heat dissipation. The driver IC according to the present embodiment has at least an input terminal and a dummy input terminal disposed in the vicinity thereof, and an output terminal and a dummy output terminal disposed in the vicinity thereof. A first signal line and a second signal line extending from the LED control device are connected to the input terminal and the dummy input terminal of the driver IC, respectively. At this time, the input terminal and the dummy input terminal can be connected to the first signal line by a joining member such as solder. Similarly, the output terminal and the dummy output terminal of the driver IC are connected to the first signal line and the second signal line, and the first signal line and the second signal line are connected to the next adjacent ones. The driver IC extends to the input terminal and the dummy input terminal and is connected. That is, the driver IC according to the present embodiment can sequentially transmit the data signal and the inverted data signal from the LED control device. For this reason, a plurality of LED units can be connected in series via a driver IC to form a display device. Similarly, when a plurality of driver ICs are provided for one LED unit, adjacent driver ICs can be sequentially connected. Each terminal of such a driver IC is not particularly limited as long as it can accurately transmit a data signal and an inverted data signal. For example, copper, aluminum, gold, silver, tungsten, iron, chromium, titanium, cobalt, molybdenum And materials such as these alloys are used.

(First signal line and second signal line)
The first signal line and the second signal line connect between the LED control device and the driver IC or between adjacent driver ICs, and transmit the data signal and the inverted data signal output from the LED control device to the driver IC. Is to do. Furthermore, since the first signal line and the second signal line are arranged substantially in parallel with each other, the magnetic field generated by the data signal can be canceled by the magnetic field by the inverted data signal. The first signal line and the second signal line may be formed in a substantially parallel pattern on the surface of the printed board on which the light emitting diode, the driver IC, and the like are mounted. You may arrange by forming.

<Example 1>
FIG. 5 is a configuration diagram schematically illustrating a connection relationship between the LED control device and the LED unit according to the first embodiment.

  As shown in FIG. 5, the display device according to Example 1 has a structure substantially similar to that of the first embodiment except that a control signal is transmitted from the LED control device 30 to each driver IC 10. The same structure may be omitted (the same applies to the following examples).

The display device according to the first embodiment includes an LED control device 30 and a plurality of LED units 100 connected in series from the LED control device 30. Further, the LED unit 100 is configured to electrically connect light emitting diodes (not shown) arranged in a matrix, a plurality of driver ICs 10 for driving the light emitting diodes, and the LED control device 30 and the LED unit 100. And at least a connector 50.
The LED control device 30 controls the data signal (A) indicating the lighting pattern of the light emitting diode, the inverted data signal (B) having the opposite phase to the data signal (A), the timing for lighting the light emitting diode, and the like. And a control signal. Furthermore, signal lines 20 and 22 for transmitting each signal to a driver IC 10 provided inside the LED unit are connected to the LED control device 30 via a connector 50. Specifically, a first signal line 20 that transmits a data signal (A), a second signal line 22 that transmits an inverted data signal (B), and a third signal line 40 that transmits a control signal, Are extended from the LED control device 30 to the driver IC 10 and connected thereto. The driver IC 10 has a plurality of terminals to which each signal line is connected. The first signal line 20 is connected to the input terminal 12, the second signal line 22 is connected to the dummy input terminal 16, and the third signal line 40 is connected. Is connected to a control input terminal (not shown). At this time, the dummy input terminal 16 is disposed in the vicinity of the input terminal 12, and the first signal line 20 and the second signal line 22 are disposed substantially in parallel. Further, the driver IC 10 includes an output terminal 14 and a dummy output terminal 18 that are electrically connected to the input terminal 12 and the dummy input terminal 16 inside. Similarly, the first signal line 20 and the second signal line 22 are connected to the output terminal 14 and the dummy output terminal 18 so as to be substantially parallel to each other, and are sequentially connected to the next adjacent driver IC. Yes. Thereby, the plurality of LED units 100 are connected in series via the driver IC 10. Further, the third signal line 40 is branched inside the LED unit and connected to each driver IC 10, and is also connected to the adjacent LED unit 100. Furthermore, the LED units are also branched in the adjacent LED units and connected to the driver ICs 10 respectively. At this time, a dummy terminal is further provided in the vicinity of the control input terminal so that a signal line for transmitting a signal having a phase opposite to that of the control signal is arranged substantially in parallel with the third signal line. Also good.

  As described above, in Example 1, it is possible to provide a display device having substantially the same effect as that of the first embodiment.

<Example 2>
FIG. 6 is a configuration diagram schematically illustrating a connection relationship between the LED control device and the LED unit according to the second embodiment.

  As shown in FIG. 6, the display device according to the second embodiment has substantially the same structure as that of the first embodiment except that each of the RGB light emitting diodes has a driver IC 10.

The display device according to the second embodiment includes an LED control device 30 and a plurality of LED units 100 connected in series from the LED control device 30. Further, the LED unit 100 is electrically connected to RGB light emitting diodes (not shown) arranged in a matrix, a plurality of driver ICs 10 for driving the light emitting diodes, and the LED control device 30 and the LED unit 100. And at least a connector 50.
Since the driver IC 10 is provided separately for each RGB light emitting diode, the data signal (A) and the inverted data signal (B) are separately supplied from the LED control device 30. That is, the first signal line 20 and the second signal line 22 are provided separately for each of RGB. For this reason, the first signal line 20 and the second signal line 22 are provided apart from each other to the extent that they are not affected by the magnetic field generated from the other first signal line 20 and the second signal line 22. It is preferable.

  As described above, in Example 2, it is possible to provide a display device having substantially the same effects as those of the first embodiment and Example 1.

  The LED unit of the present invention and a display device using the LED unit can be used for various information boards such as road information boards and river information boards, and displays installed on stadiums and building walls to display images.

  DESCRIPTION OF SYMBOLS 10 ... Driver IC, 12 ... Input terminal, 14 ... Output terminal, 16 ... Dummy input terminal, 18 ... Dummy output terminal, 20 ... 1st signal line, 22 ... 2nd signal line, 30 ... LED control apparatus, 40 ... third signal line, 50 ... connector, 100 ... LED unit, (A) ... data signal, (B) ... inverted data signal

Claims (4)

An LED unit having a driver IC for sequentially transmitting data signals from the LED control device,
The driver IC has an input terminal and an output terminal to which a first signal line for transmitting the data signal is connected, and further has a dummy terminal in the vicinity of the input terminal and the output terminal. And
Each dummy terminal is connected to a second signal line that is disposed substantially parallel to the first signal line and transmits an inverted data signal having a phase opposite to that of the data signal. LED unit characterized by The widths of the input terminal and the output terminal are substantially the same as the width of the first signal line when viewed from the upper surface side of the driver IC,
2. The LED unit according to claim 1, wherein a width of the dummy terminal is substantially the same as a width of the second signal line when viewed from the upper surface side of the driver IC.   The LED unit according to claim 1 or 2, wherein the data signal and the inverted data signal have the same absolute value of charge / discharge current. A plurality of LED units according to any one of claims 1 to 3, wherein the plurality of LED units are connected in series from the LED control device via the driver IC,
The LED control device and the driver IC, and the adjacent driver ICs are connected by the first signal line and the second signal line,
The display device, wherein the data signal and the inverted data signal are input from the LED control device to the first signal line and the second signal line, respectively.

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