JP2009198631A - Display - Google Patents

Abstract

Provided is a display device capable of preventing a malfunction or malfunction due to water leakage by ensuring waterproofness without causing a significant increase in cost.
The display device includes a display panel 30 on which a plurality of LEDs 34 and a control circuit 36 for controlling lighting of the LEDs 34 are mounted, and a display panel 30 formed in a box shape in a mounting hole provided on the front surface. And a mounted device main body. The front and back surfaces of the display panel 30 are subjected to a resin sealing process for forming a resin layer 37 as a waterproof process. The display panel 30 is provided with a connection cable 33 having a proximal end portion connected to the back surface that has been waterproofed and having a waterproof connection connector 33a at the distal end portion that ensures watertightness when combined.
[Selection] Figure 3

Description

  The present invention relates to a large display device installed along a road, in front of a station, in various facilities, and the like.

  As the brightness of light emitting diodes (hereinafter referred to as LEDs) increases, display devices using display panels in which LEDs are used as light sources in a matrix form are used in various facilities such as along roads, in front of stations, baseball fields, and racetracks. It has come to be installed.

  For example, a light-emitting display device using a light-emitting diode described in Patent Document 1 has a display panel attached to the front surface of a housing as a display surface and a circuit board disposed on the back surface of the display panel. By mounting such a light-emitting display device in a matrix form as a display panel, a large-sized display device that can enjoy images even from a distance is provided.

As shown in FIG. 7, the conventional display device 100 has display panels 102 arranged in openings provided on the front surface of a device body 101 that is a box-shaped housing. The conventional display device is waterproofed with resin or the like on the display panel surface 102a on which the LEDs are arranged so that the display panel surface 102a on which the LEDs are arranged does not cause a malfunction or malfunction even if it is installed outdoors due to rain or snow. is there. Further, a waterproof rubber is provided around the opening of the apparatus main body 101 in a frame shape so that water does not enter from between the mounting surface of the display panel 102. Further, the apparatus main body 101 is also welded to the joining portion of each steel plate, and the door portion (not shown) that enters and exits for maintenance is waterproofed so that it does not accumulate even if water enters. As shown, a drain outlet is provided at the bottom.
JP 2000-250437 A

  However, even if the conventional display device 100 takes measures against the intrusion of water as described above, in the case of a large display device having a width of several meters to several tens of meters, high waterproofness is ensured on the device main body 101 side. It is difficult. Even so, if processing for improving waterproofness is performed on the apparatus main body 101 side, the large apparatus main body 101 has many portions that need to be processed, and thus the cost increases significantly.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a display device that can prevent a malfunction or malfunction due to water leakage by ensuring waterproofness without causing a significant increase in cost.

  The display device of the present invention has a display panel on which a plurality of light sources and a control circuit for controlling lighting of the light sources are mounted, and is formed in a box shape, and the display panel is mounted in an opening provided on the front surface. In the display device including the device main body, the display panel is provided with a waterproof process on the front surface and the back surface.

  In the present invention, waterproofing is eased on the display panel side, so that waterproofing on the apparatus body side is alleviated. Therefore, even for a large display device, the cost is greatly increased by waterproofing on the apparatus body side. Increase can be suppressed. Therefore, the present invention can prevent the occurrence of malfunction or malfunction due to water leakage by ensuring waterproofness without causing a significant increase in cost.

  A first invention of the present application is a display panel on which a plurality of light sources and a control circuit that controls lighting of the light sources are mounted, and a device that is formed in a box shape and is mounted in an opening provided on the front surface A display device including a main body is characterized in that waterproofing is applied to the front and back surfaces of the display panel.

  In the display device of the present invention, waterproofing is applied to both surfaces of a display panel mounted in an opening provided in the device body. Therefore, waterproofing on the display panel side reduces the waterproofing on the device body side, so even with a large display device, the cost increases significantly due to waterproofing on the device body side. Can be suppressed.

  According to a second invention of the present application, in the first invention, the display panel has a connection connector at a distal end portion, the base end portion of which is connected to a waterproofed back surface and water tightness at the time of coupling is secured. A connection cable is provided.

  In 2nd invention of this application, when providing a connection cable in a display panel, what has the connection connector by which the watertightness at the time of a coupling | bonding was ensured in the front-end | tip part is used. Since the base end portion of this connection cable is connected to the back surface that has been waterproofed, waterproofness can be ensured even if the connection cable is provided on the display panel. Accordingly, it is possible to suppress a significant increase in cost due to waterproofing on the apparatus main body side.

  A third invention of the present application is characterized in that, in the first invention or the second invention, the waterproofing is a resin sealing process in which a control circuit is buried with a part other than the illumination part of the light source.

  In 3rd invention of this application, it can process easily and cheaply by making waterproof processing into the resin sealing process which buried the control circuit other than the illumination part of a light source.

(Embodiment)
A display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a display device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the display apparatus shown in FIG. FIG. 3 is a cross-sectional view of the display panel of the display device shown in FIG. FIG. 4 is a rear view of the display panel of the display device shown in FIG. FIG. 5 is a block diagram illustrating a configuration of a control circuit that controls lighting of the LEDs of the display device illustrated in FIG. 1. 6 is a diagram showing a connection state of the display panel of the display device shown in FIG.

  As shown in FIG. 1, the display device 10 includes a device main body 20 formed in a box shape and a plate-shaped display panel 30.

  As shown in FIG. 2, the apparatus main body 20 is formed of a steel plate whose outer surface is coated, and mounting holes 21 that are rectangular openings for mounting the display panel 30 are provided in a matrix on the front surface. It has been. The display panel 30 is fixed by screws 23 inserted through screw holes 31 provided at the corners and screw holes 22 of the apparatus body 20.

  On the back surface of the apparatus main body 20, a door (not shown) is provided for an operator to enter and exit in order to replace the failed display panel 30 and perform other maintenance. Further, a drain port (not shown) is provided at the bottom of the apparatus body 20 so that water that has entered the apparatus body 20 does not collect.

  As shown in FIGS. 3 and 4, the display panel 30 includes a printed wiring board 32, and four connection cables 33 for connecting to another display panel 30 and a control device described later.

  A display surface 35 is formed on the surface of the printed wiring board 32 by arranging LEDs 34 that emit light of red, green, or blue as a set in a matrix. A part of a control circuit 36 that controls lighting of the LED 34 is mounted on the display surface 35. The remaining control circuit 36 is mounted on the back surface of the printed wiring board 32. Here, the configuration of the control circuit 36 for controlling the lighting of the LED 34 will be described with reference to FIG.

  As shown in FIG. 5, the control circuit 36 includes an interface control unit 36a, a frame buffer memory unit 36b, a display control unit 36c, an LED driver unit 36d, a command control unit 36e, a luminance control unit 36f, A unit 36g, a memory unit 36h, and a control register unit 36j are provided.

  The interface control unit 36a is provided with a receiver or driver that inputs a signal from the control device 40 from the input-side connection connector 361 and outputs the signal to the other display panel 30 connected to the next stage to the output-side connection connector 362. I have. Here, a signal input from the input side connection connector 361 and output from the output side connection connector 362 will be described in detail.

  A [0: 3] is a 4-bit display address signal that specifies the column direction of the display panel 30. DTA [0: 9] is a display data signal indicating display data to be displayed on the display panel 30, and designates a gradation of one dot with 10 bits. DCLK is a clock signal for data fetching timing and serves as a shift clock signal to a shift register group described later. WRP is a signal indicating the timing of display data capture, and is an end signal indicating the completion of transmission of display data for one line. AEP is a clock valid signal indicating whether or not the shift clock signal (DCLK) is valid. SD is a serial data line indicating a control command, and is transmitted in synchronization with a shift clock signal (DCLK). CE is a command valid signal indicating whether or not the control command is valid. Display data and control signals are transmitted to each display panel 30 through such signal lines.

  The interface control unit 36a includes a shift register group that takes in display data by DTA [0: 9] input from the connection connector 361 on the input side and shifts it with a clock signal by DCLK. This shift register group converts serial display data into parallel display data.

  The frame buffer memory unit 36b is a readable / writable memory that stores parallel display data converted by the shift register group. The frame buffer memory unit 36b has a capacity for storing display data of the entire display panel 30.

  The display control unit 36c outputs a read address to the frame buffer memory unit 36b to read display data, and outputs the read display data to the LED driver unit 36d. The LED driver unit 36 d outputs the display data from the display control unit 36 c to the LED array configured by the LEDs 34.

  When the panel address specified by the command transmitted from the control device 40 is its own panel address, the command control unit 36e analyzes and controls the command.

  When the command control unit 36e receives the command and analyzes the command, the luminance control unit 36f instructs the luminance control unit 36f to increase or decrease the luminance when the command is a luminance adjustment command. To do.

  The luminance control unit 36f notifies the volume unit 36g of the luminance level that is set stepwise based on the luminance up or luminance down instructed by the instruction from the command control unit 36e.

  The volume unit 36g notifies the LED driver unit 36d of a value corresponding to the luminance level notified from the luminance control unit 36f. The memory unit 36h is a rewritable nonvolatile memory that stores various setting information. For example, brightness level information, panel address setting information, and the like are stored. The control register unit 36j is a register group in which various setting information read from the memory unit 36h and a panel address are stored.

  As shown in FIGS. 3 and 4, the control circuit 36 configured in this way is embedded in a resin layer 37 by performing resin sealing processing on the entire surface including the front surface and the back surface of the printed wiring board 32, thereby burying the control circuit 36. It is said.

  The resin layer 37 that embeds the control circuit 36 can be formed of, for example, silicone. In addition to completely burying the control circuit 36, the resin layer 37 is formed to have a thickness to bury the electrode part of the LED 34 while exposing the lens part as the illumination part of the LED 34 so that the light emission can be visually recognized from the front. .

  Next, the connection cable 33 will be described in detail. The connection cable 33 includes an input signal cable 331 for inputting display data and control signals from the previous stage, an input power cable 332 for inputting power and ground, and an output signal for outputting display data and control signals to the subsequent stage. A cable 333 and an output power cable 334 for outputting power and ground are provided. The input signal cable 331 and the output signal cable 333 are the same cable only with different signals to be transmitted. Similarly, the input power cable 332 and the output power cable 334 are the same cable.

  Proximal end side connection connectors are provided at the respective base end portions of the connection cables 33, and are coupled to connection connectors 361 and 362 (see FIG. 6) provided on the back surface of the printed wiring board 32. The end portion is connected to the back surface of the printed wiring board 32. A connection portion between the connection cable 33 and the printed wiring board 32 is buried in the resin layer 37. Further, a waterproof connection connector 33a is provided at the distal end of each connection cable 33 so as to ensure watertightness at the time of coupling.

  Here, the connection cable 33 for connecting the display panels 30 to each other will be described with reference to FIG.

  The leading display panel 30 is connected to a control device 40 that supplies power and generates and outputs display data and control signals by an output signal cable 333 and an output power cable 334. The output signal cable 333 of the rearmost display panel 30 is provided with a waterproof cap 33b for waterproofing on the waterproof connector 33a. In the display panel 30, the waterproof connection connector 33a of the connection cable 33 and the other adjacent display panel 30 and the waterproof connection connector 33 of the control device 40 are coupled within the apparatus main body 20 (see FIG. 1 or FIG. 2). Connected with. In this way, the control device 40 and the display panel 30 are connected in cascade by the connection cable 33.

  In this embodiment, one input signal cable 331 and one output signal cable 333 are provided as the connection cables 33, but depending on the number of display data and control signals, a plurality of them may be provided. Any connection cable can be used as long as each base end portion is connected so as to be buried in the resin layer 37, and a waterproof connection connector 33a is provided at the distal end portion.

  In this embodiment, the connection connector is used to connect the printed wiring board 32 and the connection cable 33. However, even if the signal line from the connection cable 33 is soldered directly to the connection electrode of the printed wiring board 32. Good. Even if the connection cable 33 is directly soldered, the soldered portion is sealed by the resin layer 37, so that sufficient waterproofness can be secured.

  As described above, according to the display device 10 according to the embodiment of the present invention, the electrode portion of the LED 34 and the entire control circuit 36 are provided on both surfaces of the display panel 30 mounted in the mounting hole 21 provided in the device body 20. Since the waterproof process for forming the resin layer 37 to be covered is performed, high waterproofness is not required on the apparatus main body 20 side. Further, the connection cable 33 for connecting the control device 40 and the adjacent display panel 30 has a waterproof connection connector 33a in which watertightness at the time of coupling is secured at the distal end portion, and a proximal end side connection connector at the proximal end portion. Since it is buried in the resin layer 37 on the back surface of the printed wiring board 32 that has been waterproofed, it is possible to ensure waterproofness. Therefore, even if it is the large sized display apparatus 10, the significant increase in cost by performing a waterproof process by the apparatus main body 20 side can be suppressed. Further, the waterproof processing applied to the printed wiring board 32 is a resin sealing process for forming the resin layer 37, so that the processing can be easily and inexpensively performed.

  In the display panel 30 according to the present embodiment, the LED 34 and the control circuit 36 are mounted on one printed wiring board 32. For example, if the display panel is composed of a plurality of printed wiring boards, a connection connector for connecting the printed wiring boards to face each other becomes necessary. Then, since it is necessary to perform waterproofing in a state where the connection connectors are connected to each other, the waterproofing work is complicated. By configuring the display panel 30 with a single printed wiring board 32, the above-described troublesome work can be omitted, so that an increase in cost can be further suppressed.

  In the present embodiment, the light source is the LED 34, but a point light source such as a light bulb may be used.

  Since the present invention ensures waterproofness without incurring a significant increase in cost, it is possible to prevent breakdowns and malfunctions due to water leakage, so large-scale installations along roads, in front of stations, various facilities, etc. It is suitable for the display device. It is particularly suitable for a display device installed outdoors.

The perspective view which shows the display apparatus which concerns on embodiment of this invention 1 is an exploded perspective view of the display device shown in FIG. Sectional drawing of the display panel of the display apparatus shown in FIG. The rear view of the display panel of the display apparatus shown in FIG. The block diagram which shows the structure of the circuit control which controls lighting of LED of the display apparatus shown in FIG. The figure which shows the connection state of the display panel of the display apparatus shown in FIG. A perspective view showing an entire conventional display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Apparatus main body 21 Mounting hole 22 Screw hole 23 Screw 30 Display panel 31 Screw hole 32 Printed wiring board 33 Connection cable 331 Input signal cable 332 Input power cable 333 Output signal cable 334 Output power cable 33a Waterproof connection connector 33b Waterproof cap 34 LED
35 Display surface 36 Control circuit 361, 362 Connector 36a Interface control unit 36b Frame buffer memory unit 36c Display control unit 36d LED driver unit 36e Command control unit 36f Brightness control unit 36g Volume unit 36h Memory unit 36j Control register unit 37 Resin layer 40 Control device

Claims (3)

A display panel on which a plurality of light sources and a control circuit for controlling lighting of the light sources are mounted;
In a display device comprising a device body that is formed in a box shape and the display panel is mounted in an opening provided on the front surface.
A display device, wherein the front and back surfaces of the display panel are waterproofed. The display panel is provided with a connection cable having a base connector connected to the back surface on which the waterproof processing has been performed, and having a connector at the distal end thereof that ensures watertightness at the time of coupling. The display device according to claim 1. The display device according to claim 1, wherein the waterproofing is a resin sealing process in which the control circuit and the light source other than the illumination part of the light source are buried.

Images