JP2013117661A - Display device - Google Patents

Abstract

An object of the present invention is to provide a display device that can be reduced in size and weight with a simple configuration in order to solve the problems of complication of components of the display device, enlargement of the device, and increase in weight. .
In a display device in which an LED used as a display element is mounted on a circuit board, the circuit board includes an LED lighting pattern for lighting the LED and a heat generation pattern for generating heat. The snow melting is performed by supplying power to the heat generation pattern 6.
[Selection] Figure 2

Description

  The present invention relates to a display device using LEDs, for example.

  Conventionally, as a display device using, for example, an LED, there is an LED sign disclosed in Patent Document 1 (Japanese Patent No. 4599433). Because of the snow melting of the LED sign, a far infrared heater device in the form of a cord whose outer diameter is smaller than the pitch of the LED is attached to the front surface of the LED sign display surface.

  Further, as a display device using other LEDs, there is an LED label disclosed in Patent Document 2 (Japanese Utility Model Publication No. 63-149556). In order to melt the LED sign, a linear heater is put on the upper part of the light shielding plate, and a claw-shaped heater holder is provided.

  In addition, as a display device using other LEDs, there is an outdoor video display device, and a collar is attached to each LED in order to eliminate the influence of the visibility degradation due to sunlight.

Japanese Patent No. 4599433 Japanese Utility Model Publication No. 63-149556

  In the conventional display device of Patent Document 1 described above, because of snow melting of the LED sign, a cord-shaped far infrared heater device whose outer diameter is smaller than the pitch of the LED is attached to the front surface of the LED sign display surface. The display surface goes down, and the visibility decreases when the viewing angle is large. Further, the weight is increased by the heater device.

  In addition, the display device of Patent Document 2 has a claw-shaped heater holder by placing a linear heater on top of the light-shielding plate due to snow melting of the LED sign, but the shape of the device is complicated and is held when the heater is attached. Risk of missing tools.

  In addition, in outdoor video display devices that use LEDs, in order to eliminate the effects of reduced visibility due to sunlight, firewood is attached to each LED, but snow accumulates on the firewood in winter, reducing visibility. There was a problem of end.

  Further, conventionally, a heater device is required for melting snow on the display surface, and there are problems of complication of components, an increase in size of the device, and an increase in weight as compared with a display device without a snow melting device.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display device that can be reduced in size and weight with a simple configuration.

  The display device according to the present invention is a display device in which an LED used as a display element is mounted on a circuit board, and the circuit board includes an LED lighting pattern for lighting the LED and a heat generation pattern for generating heat. It is a thing.

  According to the display device according to the present invention, a display device that can be reduced in size and weight with a simple configuration can be obtained.

It is a perspective view which shows the display apparatus concerning Embodiment 1 of this invention. It is sectional drawing in the AA of FIG. 1 which shows the display apparatus concerning Embodiment 1 of this invention. It is sectional drawing in the AA of FIG. 1 which shows the display apparatus concerning Embodiment 1 of this invention. It is sectional drawing in the AA of FIG. 1 which shows the display apparatus concerning Embodiment 1 of this invention. It is sectional drawing which shows the display apparatus concerning Embodiment 2 of this invention. It is sectional drawing which shows the display apparatus concerning Embodiment 3 of this invention. It is sectional drawing which shows the display apparatus concerning Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. In the drawings, the same or equivalent members and parts will be described with the same reference numerals. 1 is a perspective view showing a display device according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line AA of FIG. 1, showing the display apparatus according to Embodiment 1 of the present invention. 3 is a cross-sectional view taken along the line AA of FIG. 1, showing a display device according to Embodiment 1 of the present invention. 4 is a cross-sectional view taken along the line AA of FIG. 1 showing the display apparatus according to Embodiment 1 of the present invention.

As shown in FIG. 1, in the display device 1 according to the first embodiment, a plurality of display units 3 are arranged in a housing 2 vertically and horizontally without any gaps.

  As shown in FIG. 2, the circuit board 4 on which the LEDs 5 are mounted is composed of a multilayer board on which an LED lighting pattern 7, an insulator (not shown), and a heat generation pattern 6 are laminated. The LEDs 5 are arranged on the front surface of the circuit board 4 at regular intervals, and a louver 10 made of a heat conductive material is attached to the top of the LEDs 5. The louver 10 has an inclination on the upper surface, covers the upper side of the LED 5 and protrudes so as to block sunlight, and is in thermal contact with the circuit board 4.

  As shown in FIG. 3, silicone resin 11 is applied between the LED 5 and the louver 10 to increase the black level of the display unit or to prevent water from entering from the front side of the circuit board 4.

  In some cases, as shown in FIG. 4, a transparent resin case 12 that covers the entire LED 5 is attached, and the louver 10 is attached to the front surface of the transparent resin case 12.

  On the back surface of the circuit board 4, an electronic component group 9 (semiconductor elements, connectors for inputting control signals from the outside, etc.) for turning on the LEDs 5 is also disposed.

  According to this structure, the heat generation pattern 6 of the circuit board 4 has a heater function. By supplying power to the circuit board 4, the entire layer of the heat generation pattern 6 made of copper wiring generates heat with a uniform heat generation density, and the metal leads of the LEDs 5 that are in thermal contact with the circuit board 4 or a louver 10 made of a heat conductive material. Heat conduction to

Accordingly, the surface of the LED 5 and the upper surface of the louver 10 can be heated without uneven temperature, and the snow adhering to the display unit of the display device 1 can be melted without unevenness. The viewer can always read accurate information.

  Further, power saving can be realized by controlling power supply to the heat generation pattern 6 only when the temperature detected by the temperature sensor 8 using the LED lighting pattern 7 is equal to or lower than a predetermined temperature. Further, when the temperature detected by the temperature sensor 8 using the LED lighting pattern 7 is equal to or higher than a predetermined temperature, power saving can be realized by controlling the power supply to the heat generating pattern 6 to stop. The LED lighting pattern 7 and the heat generation pattern 6 are supplied from, for example, the same power source.

  In the first embodiment described above, the louver 10 is physically in contact with the circuit board 4, but as shown in FIGS. 3 and 4, the silicone resin 11 and the resin case 12 are interposed between the louver 10 and the circuit board 4. You may do it. This structure has an advantage that water generated by melting snow can be prevented from entering from the front side of the circuit board 4.

  Further, in the structure shown in FIG. 2, the heat generation pattern 6 has a single layer structure, but a structure having a plurality of heat generation patterns 6 may be used (not shown). In this case, by connecting the heat generation patterns 6 of each layer in parallel, the amount of heat generation can be increased without changing the power supply voltage, and the case where the outside air temperature in the area where the display device 1 is installed is lower than in other areas is also supported. There is an advantage that the calorific value can be adjusted.

As described above, by using the display device 1 according to Embodiment 1, it is possible to prevent snow melting, snow accretion and freezing of the display unit of the display device 1 without changing the outer shape, the number of parts, and the weight of the display unit 3. It is possible to realize.
Moreover, since the circuit board 4 is the same size as the display part of the display device 1, in addition to being able to heat the entire display part with a uniform heat generation density, the power used for the heat generation of the circuit board 4 can be effectively used for melting snow.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. 5 is a sectional view showing a display device according to Embodiment 2 of the present invention.

  As shown in FIG. 5, the heat generation pattern 6 may be divided in the same layer and connected in series to be fed by the same power supply 13. In this case, the amount of heat generation can be reduced without changing the voltage of the power supply 13, and there is a merit that power consumption can be reduced even when the outside air temperature in the area where the display device 1 is installed is higher than in other areas. is there.

  By using the display device 1 according to the second embodiment, the display unit 3 can be provided with a snow melting function by changing the layer configuration without changing the outer shape of the circuit board 4. Excellent compatibility with the unit.

  Each heating pattern 6 is supplied with power using the circuit of the circuit board 4 and does not use wiring for supplying power to the heater. Therefore, failure of the heater due to disconnection of the lead wire is eliminated, and reliability is improved. Since the display device 1 can be assembled and replaced by the same operation as a display device that does not have a snow melting function, it helps to improve the quality of manufacturing.

  Only when the temperature detected by the temperature sensor 8 on the circuit board 4 is equal to or lower than a predetermined temperature, power can be saved by supplying power to the heat generation pattern 6.

Since the heat of the heat generation pattern 6 can be transmitted to the LED 5 mounted on the circuit board 4 without thermal loss without using a heat conductor, electronic components other than the LED 5 can be efficiently heated and protected from a low temperature environment. .

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a sectional view showing a display device according to Embodiment 3 of the present invention.

  As shown in FIG. 6, the heat generation pattern 6 and the LED lighting pattern 7 may be arranged on the same layer of the circuit board 4. As an example, the figure shows a case where the LED lighting pattern 7 is arranged on the upper side and the heat generation pattern 6 is arranged on the lower side.

  By using the display device 1 according to the third embodiment, in addition to ensuring visibility when sunlight is directly irradiated, heat is transmitted from the circuit board 4 to the louver 10 during snowfall, and snow melting on the upper part of the louver 10 is performed. Even if the snow remains unmelted, the contact portion between the snow and the louver 10 is melted. Therefore, the snow falls from the louver 10 due to the inclination of the upper surface of the louver 10, and the visibility of the display unit of the display device 1 is maintained.

Embodiment 4 FIG.
Embodiment 4 of the present invention will be described with reference to FIG. FIG. 7 is a sectional view showing a display apparatus according to Embodiment 4 of the present invention.

  In FIG. 7, the display unit 3 is installed with the front tilted. Since the display unit 3 is tilted forward, the slope of the top surface of the louver 10 is steeper than that of each of the above-described embodiments, and in addition to ensuring visibility when sunlight directly shines, snow attached to the louver 10 Is melted from the contact portion with the louver 10, so that even if all the snow is not melted, the snow slides down from the louver 10 due to a steep slope, and the visibility of the display unit of the display device 1 is quickly recovered. .

  In the example shown in FIG. 7, the inclination angle of the display unit 3 has been described as being 5 °, but may be changed within a range of 0 ° to 15 °.

  By the way, in each embodiment mentioned above, although the louver 10 is comprised by the inclined surface of the upper surface, and the horizontal surface of the lower surface, although not shown in figure, the elongate board comprised parallel to the up-and-down surface is perpendicular | vertical to the circuit board 4. May be installed at an inclination with respect to the circuit board 4, and the same effects as those of the above-described embodiments can be obtained.

  Further, although not shown, the louver 10 may be attached to and integrated with a plate made of a heat conductive material having a hole corresponding to the shape of the LED 5. According to this structure, in addition to easy attachment and detachment of the louver 10, it is possible to expect an effect of suppressing heat dissipation from the circuit board 4 to the outside air and improving heat retaining properties in the event of wind and snow because the plate becomes a wall.

  In addition, the power supply to the LED lighting pattern 7 and the heat generation pattern 6 has been described for the case where power is supplied from, for example, the same power source. However, the power supply may be supplied from different power sources. Although the case where power is supplied from the same power source has been described, power may be supplied from different power sources, and the same effects as those of the above-described embodiments can be obtained.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  The present invention is suitable for realizing a display device that can be reduced in size and weight with a simple configuration.

DESCRIPTION OF SYMBOLS 1 Display apparatus 3 Display unit 4 Circuit board 5 LED
6 Heat generation pattern 7 LED lighting pattern 8 Temperature sensor 10 Louver 13 Power supply

Claims (9)

  A display device in which an LED used as a display element is mounted on a circuit board, wherein the circuit board includes an LED lighting pattern for lighting the LED and a heat generation pattern for generating heat. .   The display device according to claim 1, wherein the heat generation pattern is divided into a plurality of parts.   The display device according to claim 1, wherein the LED lighting pattern and the heat generation pattern are arranged in the same layer.   The display device according to claim 3, wherein the LED lighting pattern is disposed on an upper side, and the heat generation pattern is disposed on a lower side.   2. The louver according to claim 1, further comprising a louver that covers the LED and is disposed in thermal contact with the front side of the circuit board, is made of a thermally conductive material, and has an inclined top surface. 5. The display device according to any one of 4.   6. The display device according to claim 1, wherein the LED lighting pattern and the heat generation pattern are supplied from the same power source.   The display device according to any one of claims 1 to 5, wherein the LED lighting pattern and the heat generation pattern are supplied from different power sources.   The display device according to claim 1, wherein a temperature sensor is disposed on the circuit board.   The display device according to claim 5, wherein the circuit board is tilted forward.

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