JP2010282109A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device having a liquid crystal display unit that can be safely used even in a severe high temperature environment, on the assumption that the device is used indoors near a window directly exposed to sun rays or outdoors. <P>SOLUTION: The display device 1 can be installed, for example, indoors or outdoors with the top face thereof directing to a viewer. The display device 1 can be used as installed at a shop front, a place close to a window, or the like, and is mounted on an upper end of a pole 4 standing on a base 3 having castors 2 on the lower face of the base. That is, the display device 1 is movable on a road or a floor by the castors 2 on the lower face of the base 3, and can be installed, for example, at a shop front or on a road. The display device 1 includes, in the front face thereof, a liquid crystal display unit 6 in an upper part together with an LED display unit 7 in a lower part. The liquid crystal display unit 6 can display a video or an image on the surface, while the LED display unit 7 includes a plurality of LED elements arrayed in a matrix and can display information on the surface by optionally lighting each LED element. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device that includes a display body including a liquid crystal display portion on the surface and is suitable for installation outdoors or indoor windows that are exposed to direct sunlight.

  2. Description of the Related Art Conventionally, an electric signboard is used as a means to alert a pedestrian at a construction site adjacent to a sidewalk or to notify a pedestrian of store information in front of a store. As a signboard generally used for electroluminescence display, a display device having an LED display section in which a plurality of LED light emitting elements are arranged in a matrix, each LED light emitting element is arbitrarily turned on, and information can be displayed on the surface. It has been known. For example, a display device according to Patent Document 1 below is a display body including an LED display unit in which a plurality of LED light emitting elements are arranged in a matrix on one surface of a rectangular housing, and the one surface is viewed by a viewer ( For example, store information (product price information, event information, etc.) and alerts during construction (overhead warning, inconvenience) , Etc.) is displayed with static or dynamic changes.

  By the way, in the display device provided with such an LED display unit, the installation location does not stop indoors but is outdoor (storefront, construction site, etc.), and therefore the direct sunlight is applied to the display device. It is said. Such a display device is equipped with electronic components such as an LED board and a controller inside a casing made of aluminum plate or synthetic resin. It is supposed that problems such as deterioration or deformation of the resin casing occur.

For this reason, in this type of conventional display device, a cooling fan having a temperature sensor is provided inside the housing, and the cooling fan is driven when the temperature sensor senses a temperature state above a certain level. The internal air is exhausted to prevent the built-in electronic components from becoming hot, or the housing itself is prevented from becoming hot.

  By the way, as a manufacturer who has long developed and manufactured a display device having an LED display unit as described above, the applicants employ a thin liquid crystal display device that can display images or images on the surface of such a display device. We have just examined whether it is possible. The reason is that the liquid crystal display device can inform the passersby of the store information in detail, for example, “Recommended products of the day”, “Cooking scenery”, “Food provision place”, etc. This is because it is possible to expect a merit that the information can be provided to passersby in detail in real time using images and videos, which can lead to an increase in the ability to attract customers and an increase in sales.

However, liquid crystal display devices are more vulnerable to high-temperature environments than display devices composed of LED light-emitting elements, and the installation location is exclusively for indoor light and direct sunlight. There was no place. The reasons are: a. When the liquid crystal body is above a certain temperature, the liquid crystal phase liquefies and disappears, b. Display abnormality or non-display due to breakage of liquid crystal circuit components, c. The lighting life of the backlight lamp unit is shortened, d. There were problems such as deformation of the synthetic resin material around the liquid crystal. For this reason, as shown in Patent Document 2 below, a cooling fan provided with a temperature sensor is built in a casing that is provided with such a liquid crystal display on the surface, and the temperature sensor has a temperature state above a certain level. A method of preventing the built-in electronic parts and the liquid crystal display itself from becoming hot or preventing the housing from becoming hot by driving the cooling fan when detected and exhausting the air inside the housing Was considered.

  However, the applicants manufactured a prototype of a display device with a built-in cooling fan equipped with a temperature sensor in a housing with such a liquid crystal display on the surface, and assumed an outdoor environment exposed to direct sunlight. When endurance experiments were conducted under these circumstances, these prototypes could not solve the above-mentioned problems a to d in the liquid crystal display device, and it was difficult to put them into practical use.

JP 2003-280534 A JP 07-168160 A

  The present invention has been made in view of the above-described background, and is generally used not only in indoor environments where liquid crystal display devices are used, but also indoors where only direct sunlight shines, as well as indoor windows and outdoors where direct sunlight is applied. Therefore, it is an object of the present invention to provide a display device including a liquid crystal display unit that can be used safely even in such a severe high temperature environment.

  In order to solve the above-described object, according to the first aspect of the present invention, a liquid crystal display unit capable of displaying a video or an image on the surface is arranged on one surface of a casing having a planar shape, and the one surface is visually recognized. In a display device comprising a display body that can be installed indoors or outdoors as a state oriented to a person, and a cooling fan that can cool a liquid crystal display unit in a housing of the display body, The display body casing includes a temperature sensor that measures the temperature in the casing in which the liquid crystal display unit is disposed, and a photosensor that measures the illuminance of light applied to the display body. Within the housing, a drive control unit that controls ON / OFF driving of the cooling fan, a drive circuit that drives the liquid crystal display unit, and can display an arbitrary image or image on the liquid crystal display unit, and the drive circuit is turned on・ Can be turned off and the liquid crystal display can be turned on. And a lighting control unit that enables FF, and further inputs an illuminance measured by a photosensor to the controller, detects whether or not the input illuminance exceeds a certain level, and Input the illuminance detection unit that outputs a signal for turning on the cooling fan to the cooling fan drive control unit and the temperature measured by the temperature sensor when the level is higher than the level, and the input temperature is a constant level A temperature detection unit that detects whether or not it is above and outputs a signal for turning on the cooling fan to the driving control unit of the cooling fan when the level is above a certain level.

  According to a second aspect of the present invention, there is provided an LED display unit that allows a plurality of LED light emitting elements to be arranged in a plane, each LED light emitting element is arbitrarily turned on, and information can be displayed on the surface, and an image. Alternatively, a liquid crystal display unit that can display an image on the surface, and a display body that can be installed indoors or outdoors in a state in which the one surface is directed to a viewer, with the one surface facing the viewer The display body includes a cooling fan that can cool the LED display and the liquid crystal display, and the display body includes an LED display and A temperature sensor that measures the temperature inside the box with the liquid crystal display unit and a photosensor that measures the illuminance of the light radiated on the display body are provided. Drive control unit for controlling OFF drive, LE Driving to drive the display unit and the liquid crystal display unit, arbitrarily turn on each LED light emitting element of the LED display unit, and display arbitrary information on the surface, or display any video or image on the liquid crystal display unit A controller that includes a circuit and a lighting control unit that can turn on / off the drive circuit and can turn on / off the operation of the LED display unit or the liquid crystal display unit. Inputs the illuminance to be measured, detects whether or not the input illuminance is above a certain level, and if it is above a certain level, outputs a signal for turning on the cooling fan to the drive control unit of the cooling fan Input the illuminance detector to output and the temperature measured by the temperature sensor, detect whether the input temperature is above a certain level, and if it is above a certain level, Characterized in that it comprises a temperature detecting section for outputting a signal for the ON cooling fan to the drive control unit of the emission, the.

  According to a third aspect of the present invention, the temperature detection unit of the controller inputs the temperature measured by the temperature sensor, detects whether the input temperature is below a certain level, and if the temperature is below the certain level, the cooling The display device according to claim 1 or 2, wherein a signal for turning off the cooling fan is output to a drive control unit of the fan.

  According to a fourth aspect of the present invention, the temperature detection unit of the controller inputs the temperature measured by the temperature sensor, detects whether the input temperature is equal to or higher than a certain level, and turns on when the temperature is higher than a certain level. The display device according to claim 1, wherein a signal for turning off the driving circuit and turning off the operation of the liquid crystal display unit is output to the control unit.

  According to a fifth aspect of the present invention, the temperature detection unit of the controller inputs the temperature measured by the temperature sensor, detects whether the input temperature is equal to or higher than a certain level, and turns on when the temperature is higher than a certain level. The display device according to claim 2, wherein a signal for turning off the operation of the LED display unit and the liquid crystal display unit is output to the control unit.

  According to a sixth aspect of the present invention, the drive control unit of the cooling fan in the controller inputs a signal for turning on the cooling fan from the illuminance detection unit, and after the input, within a certain period of time measured by a timer. Is to turn on the cooling fan, input a signal for turning on the cooling fan from the illuminance detection unit, and execute the control to turn off the cooling fan after a certain period of time measured by the timer. A display device according to any one of claims 1 to 5 is provided.

  According to a seventh aspect of the present invention, the illuminance detection unit inputs from the photo sensor, detects whether or not the input illuminance is equal to or higher than a certain level. On the other hand, the display device according to claim 1, wherein a value of a certain level when a signal for turning on the cooling fan is output is a value of a level of 70,000 lx or more.

  According to an eighth aspect of the present invention, the temperature detection unit inputs from the temperature sensor, detects whether or not the input temperature is equal to or higher than a certain level, and if it is equal to or higher than the certain level, 3. The display device according to claim 1, wherein a value of a certain level when a signal for turning on the cooling fan is output is an arbitrary value in a range of 50 ° C. or lower to room temperature. It is said.

  According to a ninth aspect of the present invention, the temperature detection unit inputs from the temperature sensor, detects whether or not the input temperature is below a certain level, and if the temperature is below the certain level, the drive control unit of the cooling fan The display device according to claim 3, wherein a value at a certain level when a signal for turning off the cooling fan is output is an arbitrary value in a range from 40 ° C. or lower to room temperature.

  According to a tenth aspect of the present invention, the temperature detection unit inputs from a temperature sensor, detects whether or not the input temperature is above a certain level, and drives the lighting control unit when the temperature is above a certain level. The display device according to claim 4, wherein a value at a certain level in the case of outputting a signal for turning off the circuit and turning off the operation of the liquid crystal display unit is an arbitrary value in a range of 70 ° C. or lower to room temperature. Yes.

  According to an eleventh aspect of the present invention, the temperature detection unit receives an input from a temperature sensor, detects whether the input temperature is equal to or higher than a certain level, and drives the lighting control unit when the temperature is higher than a certain level. The constant level value in the case of outputting a signal for turning off the circuit and turning off the operation of the LED display unit and the liquid crystal display unit is set to an arbitrary value in a range of 70 ° C. or lower to room temperature. As a display device.

  According to the present invention, it is generally assumed that the liquid crystal display device is used not only in an indoor environment where only the indoor light is applied, but also in an indoor window or outdoor where it is exposed to direct sunlight. When the photosensor measures the light applied to the display body and the illuminance of the measured light exceeds a certain level, the cooling fan is driven. As a result, the display body including the liquid crystal display unit is irradiated with direct sunlight or the like, and the cooling fan is driven quickly in a stage before the temperature rise is detected by the temperature sensor in the housing or the inside thereof. It will be. For this reason, the temperature rise of the entire display device including the liquid crystal display unit and the electronic components inside the housing can be prevented accordingly. Therefore, there is an effect that it is possible to provide a display device including a liquid crystal display unit that can be used with confidence.

1 is a perspective view showing an entire display device according to an embodiment of the present invention. It is a front view of a display apparatus. It is a front view etc. which show the flow of the air in the housing | casing of a display apparatus. It is sectional drawing which follows the IV-IV line of FIG. It is a block diagram which shows the control system of a display apparatus. It is a flowchart which shows the control system in case a drive circuit is turned ON or OFF in a lighting control part. It is a flowchart which shows the control system in the case of turning ON or OFF the drive signal to the cooling fan in a drive control part. It is a figure which shows the time change of the drive state of the cooling fan corresponding to the temperature change of a display apparatus in the display apparatus in the state in which sunlight is not directly irradiated. It is a figure which shows the time change of the drive state of the cooling device corresponding to the temperature change of a display apparatus when the illumination intensity detection part temporarily does not function in the display apparatus in the state in which sunlight is directly irradiated. It is a figure which shows the time change of the drive state of the cooling device corresponding to the temperature change of a display apparatus when the illumination intensity detection part in this invention functions in the display apparatus in the state in which sunlight is directly irradiated.

  1 to 4 show a display device according to an embodiment of the present invention. The display device 1 can be installed and used not only outdoors in a store that is exposed to direct sunlight, but also at an indoor window, etc., as shown in FIG. The pole 4 is erected and attached to its upper end. That is, the display device 1 can be moved on a road surface or a floor surface by the casters 2 on the lower surface of the base 3, and can be installed on a storefront or a road, for example.

The display device 1 has a vertically long rectangular shape when viewed from the front, and has a planar shape that is entirely flat. That is, as shown in FIG. 4, the display device 1 includes a metal main body 5B (housing) having a generally flat surface shape, and a front surface of the main body portion 5B having the same surface shape made of a transparent synthetic resin material. It is formed by attaching a flat board material 5A (housing) made of The display device 1 can be installed indoors or outdoors, for example, in a state where the flat board material 5A side is the front surface and the front surface (one surface) is directed to the viewer. The display device 1 serves as a display body for displaying information on the board material 5A on the front side toward the viewer. The liquid crystal display unit 6 is provided on the upper side and the LED display unit 7 is provided on the lower side when viewed from the front side. It is arranged in a state.

As shown in FIG. 2, the liquid crystal display unit 6 has a rectangular shape when viewed from the front, and can display an image or an image on the surface. That is, as shown in FIG. 4, the liquid crystal display unit 6 is composed of an LCD substrate 6A housed in a housing made up of a main body 5B and a board material 5A, and is visually recognized on the board material 5A side of the substrate 6A. It is possible to display a video or an image directed to a person. On the other hand, the LED display unit 7 has a rectangular shape when viewed from the front like the liquid crystal display unit 6, and a plurality of LED light emitting elements are arranged in a matrix shape, and each LED light emitting element is arbitrarily turned on to be on the surface. Information can be displayed. That is, as shown in FIG. 4, the LED display unit 7 is also composed of an LED substrate 7A housed in a housing made of a main body unit 5A and a board material 5B, and each LED light emitting element can be turned on arbitrarily. The information toward the viewer can be displayed on the board material 5A side of the substrate 7A. Therefore, the viewer visually recognizes information on the image or image on the liquid crystal display unit 6 that is transmitted through the transparent board material 5A or information displayed on the LED display unit 7 on the surface side of the display device 1. Is possible.

  As shown in the side view of FIG. 3 (B), the display device 1 can be used by connecting the terminal 8A of the connection cord 8 to an external AC power source (not shown). The power supply 9 is made to input the power of the external power supply. In FIG. 3B, reference numeral 10 denotes ground. That is, the entire display device 1 can be driven by power supplied from the power source 9 including the liquid crystal display unit 6, the LED display unit 7, and a cooling fan described later.

In the main body 5B of the display device 1, the LCD substrate 6A is supported by the main body 5B via the bracket 11 and by the main body 5B via the LED substrate 7A bracket 12 (see FIG. 4). The power source 9 is directly supported by the main body 5B, and a circuit board 13 that controls the overall driving of the display device 1 is supported in the main body 5B of the power source 9.

The bracket 12 that supports the LED substrate 7A further supports the substrate 14A of the light receiving device 14. As shown in FIG. 1 or 2, the light receiving device 14 is disposed below the board material 5 </ b> A when viewed from the front, and through the board material 5 </ b> A made of a transparent material in the same manner as the liquid crystal display unit 6 and the LED display unit 7. The surface can be directed toward a viewer (a viewer viewing each of the display units 6 and 7). As shown in the enlarged portion of FIG. 2, the light receiving device 14 includes light receivers 15 </ b> A and 15 </ b> B and a photo IC 16. The light receivers 15A and 15B receive optical signals emitted from a remote controller (not shown) for operating the entire display device 1 (main power ON / OFF, information display content selection or input operation, etc.). Is to do. The photo IC 16 as a photosensor is for receiving light (sunlight, indoor light, etc.) irradiated on the surface side of the display device 1 (the surface side of the board material 5A as a display body). That is, the photo IC 16 measures the illuminance of light irradiated on the surface side of the display device 1, and the measured illuminance is input to the circuit board 13.

In the main body 5B of the display device 1, as shown in FIG. 4, a temperature sensor 17 for measuring the temperature in the main body 5B as a housing is provided. The temperature sensor 17 is a thermistor sensor, and the temperature in the main body 5B measured by the temperature sensor 17 is input to the circuit board 13 in the same manner as the illuminance of light measured by the photo IC 16. Yes.

As shown in the bottom view of FIG. 3 (C), the main body 5B as a housing has an intake port 18 communicating with the bottom and the inside of the main body 5B, as shown in the side view of FIG. 3 (B). Thus, the exhaust port 19 which connects the exterior and the inside of the main-body part 5B is formed in the side surface, respectively. A cooling fan 20 is disposed above the main body 5B as shown in the internal enlarged portion of the front view of FIG. 4 or FIG. An exhaust duct 21 connected to the exhaust port 19 is connected to the cooling fan 20. In the main body 5 </ b> B of the display device 1, the cooling fan 20 is rotated to drive the main body 5 </ b> B outward from the intake port 18 on the bottom surface. The air (outside air) can be inhaled. The air sucked into the main body portion 5B as the casing in this way moves up in the main body portion 5B as shown by the arrow in FIG. 3A, and passes through the cooling fan 20 and the exhaust duct 21 as the intake source. It is possible to exhaust air from the exhaust port 19 to the outside of the main body 5B.

Thus, air can be circulated in the main body portion 5B from the intake port 18 to the exhaust port 19 based on the ON drive of the cooling fan 20. As a result, each electronic component including the liquid crystal display unit 6 (LCD substrate 6A), the LED display unit 7 (LED substrate 7A), the power source 9, and the circuit board 13 disposed in the main body 5B is cooled by the circulating air. The Rukoto.

The cooling fan 20 can be driven by electric power supplied from the power supply 9, and ON / OFF driving of the cooling fan 20 is controlled and controlled by a drive control unit 23 of a controller 22 provided in the circuit board 13 (FIG. 5). reference).

Next, a driving process of the display device 1 configured as described above will be described with reference to FIGS. First, each of the liquid crystal display unit 6 and the LED display unit 7 can be driven based on a signal input from the drive circuit 24 as shown in FIG. 5, and the drive circuit 24 can display on the liquid crystal display unit 6. A video or image data signal can be output to the liquid crystal display unit 6, and a data signal of information to be displayed by arbitrarily lighting each LED light-emitting display on the LED display unit 7 can be output to the LED display unit 7.

These data signals are input in advance from the input device 25 and stored in the memory 26 as shown in FIG. 5, and are stored in the memory 26 from the drive circuit 24 when the liquid crystal display unit 6 or the LED display unit 7 is operated. Corresponding data signals are output to the liquid crystal display unit 6 or the LED display unit 7. The data signal may be stored in advance in a storage medium such as a CD or DVD, and the recorder 27 is driven when the liquid crystal display unit 6 or the LED display unit 7 is operated, and the corresponding data stored in the storage medium. The signal may be output from the drive circuit 24 to the liquid crystal display unit 6 or the LED display unit 7.

The lighting operation (ON / OFF drive operation, etc.) of the liquid crystal display unit 6 and the LED display unit and the ON / OFF drive of the cooling fan 20 are built in the circuit board 13 and can be controlled by the controller 22 shown in FIG. The That is, the controller 22 performs a lighting operation (ON / OFF operation) of the liquid crystal display unit 6 and the LED display unit 7 on the drive circuit 24 based on an operation (ON / OFF operation) of a power switch (not shown). Further, a lighting control unit 28 for controlling output of data signals from the memory 26 and the recorder 27 to the drive circuit 24, the liquid crystal display unit 6, and the LED display unit 7 is provided. The controller 22 includes a drive control unit 23 that controls ON / OFF driving of the cooling fan 20 based on a signal output from the temperature detection unit 29 in the main body 5B or a signal output from the illuminance detection unit 30. .

The illuminance of light irradiated on the surface side of the display device 1 measured by the photo IC is digitally converted by an A / D converter 31 in the controller 22 and input to the temperature detection unit 30. Similarly, the temperature in the main body 5 </ b> B measured by the temperature sensor 17 is digitally converted by the A / D converter 31 in the controller 22 and input to the temperature detector 29.

The illuminance detection unit 30 detects whether or not the illuminance input from the photo IC 16 side is above a certain level via the A / D converter 31, and drives the cooling fan 20 when the value is above a certain level. A signal for turning on the driving of the cooling fan 20 can be output to the control unit 23.

Further, the temperature detection unit 29 detects whether or not the temperature input from the temperature sensor 17 side is above a certain level via the A / D converter 31, and when it is above the certain level, the driving control of the cooling fan 20 is performed. A signal for turning on the driving of the cooling fan 20 can be output to the unit 23.

  Further, the temperature detection unit 29 detects whether or not the temperature input from the temperature sensor 17 via the A / D converter 31 is below a certain level, and when the temperature is below the certain level, the cooling fan 20 is driven. A signal for turning off the driving of the cooling fan 20 can be output to the control unit 23, and it is detected whether the input temperature is equal to or higher than a certain level. In contrast, the drive circuit 24 is turned off, and a signal for turning off the operation of the liquid crystal display unit 6 and a signal for turning off the operation of the LED display unit 7 can be output.

In the drive control unit 23 of the cooling fan 20 in the controller 22, when a signal for turning on the cooling fan 20 is input from the illuminance detection unit 30, a timer 32 (time count) provided in the controller 22 is input after the input. Within a certain time period measured by the circuit), the driving of the cooling fan 20 is turned on, a signal for turning on the cooling fan 20 is input from the illuminance detection unit 30, and the timer 32 measures after the input. After the elapse of time, control for turning off the cooling fan 20 is executed. In the embodiment, this fixed time is set to 60 seconds.

  Here, the illuminance detection unit 30 inputs from the photo IC 16 side, detects whether the input illuminance is equal to or higher than a certain level, and when the illuminance is higher than a certain level, the cooling fan 20 controls the drive control unit 23 of the cooling fan 20. When a signal for turning ON 20 is output, the constant level value is preferably a level value of 70,000 lx or more, and is set to 70,000 lx in this embodiment. Further, the temperature detection unit 29 inputs from the temperature sensor 17 side, detects whether or not the input temperature is equal to or higher than a certain level, and if it is equal to or higher than the certain level, the cooling fan 20 controls the drive controller 23 of the cooling fan 20. When a signal for turning on 20 is output, the constant level value is preferably an arbitrary value in the range of 50 ° C. or lower to room temperature, and is set to 50 ° C. in this embodiment.

Further, the temperature detection unit 29 inputs from the temperature sensor 17 side, detects whether or not the input temperature is above a certain level, and turns off the drive circuit 24 with respect to the lighting control unit 28 when the temperature is above a certain level. In the case where a signal for turning off the operation of the LED display unit 6 or the liquid crystal display unit 7 is output, the constant level value is preferably an arbitrary value in the range of 70 ° C. or less to room temperature. Then, it is set to 70 ° C. In addition, an input is made from the temperature sensor 17 side, and it is detected whether or not the input temperature is below a certain level. When the temperature is below a certain level, the cooling fan 20 is turned off with respect to the drive control unit 23 of the cooling fan 20. The value of the constant level when the signal for outputting is set to 40 is preferably an arbitrary value in the range of 40 ° C. or lower to room temperature, and is set to 40 ° C. in this embodiment.

Thus,
a. A value of a fixed time (60 seconds) set by the drive control unit 23 and measured by the timer 32 (time measuring circuit),
b. A constant level value (70,000 lx) that is set in the illuminance detection unit 30 and outputs a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20.
c. A constant level value (50 ° C.) that is set in the temperature detection unit 29 and outputs a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20.
d. A value set at the temperature detection unit 29 and a value at a certain level when the drive circuit 24 is turned off to the lighting control unit 28 and a signal for turning off the operation of the LED display unit 7 or the liquid crystal display unit 6 is output ( 70 ° C),
e. A value of a certain level (40 ° C.) in the case where a signal for setting the cooling fan 20 to OFF is output to the drive control unit 23 of the cooling fan 20, which is set in the temperature detection unit 29.
Is the numerical value as described above (a to e) or the numerical value range as described above, because the inventors of the present application manufactured a prototype of the display device 1 according to the present invention and repeated trial and error. The state where the display device 1 operates safely has been found and introduced. That is, the inventors of the present application assume the harshest environment for the liquid crystal display unit 6 or the like during the daytime when sunlight or the like is irradiated, and irradiate artificial light with the prototype of the display device 1 to heat the temperature. As a result of conducting an experiment to measure the upper limit of the temperature at which the LCD substrate 6A constituting the liquid crystal display unit 6 operates safely and does not cause damage to the liquid crystal or the like, as shown in FIG. The room temperature was found to be in the range (for example, about 8 ° C. or higher). Further, in the same experimental environment, the upper limit of the temperature at which the LED board 7A constituting the LED display unit 7 operates safely and does not damage the circuit of the LED board or the like is from 85 ° C. or less to normal room temperature as shown in FIG. It was found to be in the range (for example, about 8 ° C. or more).

Furthermore, the inventors of the present application assume the environment in the case where there is no direct sunlight as shown in FIG. 8 for the manufactured prototype of the display device 1, and in the main body 5B of the prototype of the display device 1. In addition to measuring the measurement value of the temperature sensor 17 installed in the main body 5B, a temperature sensor is also installed in the vicinity of the LCD substrate 6A in the main body 5B to measure the liquid crystal ambient temperature. An experiment to find a state in which the vehicle is safely driven (measurement of the time transition of the cooling state in the main body 5B by driving the cooling fan 20: see FIG. 8), assuming a case where there is direct sunlight as shown in FIG. The measurement value of the temperature sensor 17 installed in the main body 5B of the prototype of the display device 1 is measured, and a temperature sensor is also installed in the vicinity of the LCD substrate 6A in the main body 5B so that the liquid crystal ambient temperature is also Measure and display LCD 6 and LED Radical 113 7 (measurement of the time course of the cooling state of the body portion 5B by driving the cooling fan 20, see FIG. 9) experiments to find a state of safe driving performed respectively. At that time, in the experiment shown in FIG. 9, the illuminance detection unit 30 in the controller 22 is not intentionally functioned as in the conventional case, and a signal for turning on the cooling fan 20 is output to the drive control unit 23. Experiments that were not performed were also performed.

As a result, as shown in the experimental results of FIG. 8, assuming that there is no direct sunlight on the display device 1 and the temperature detection unit 29 is set as in the following c and e,
c. Although it is set in the temperature detection unit 29, a value of a certain level (50 ° C.) when a signal for turning on the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20;
e. A constant level value (40 ° C.) when a signal for turning off the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20 set in the temperature detection unit 29,
The measured value of the temperature sensor installed in the vicinity of the LCD substrate 6A that the LCD substrate 6A constituting the liquid crystal display unit 6 operates safely and can always maintain the upper limit (70 ° C. or lower) of the temperature at which the liquid crystal or the like is not damaged. It was confirmed by. That is, the experimental result of FIG. 8 is that the temperature detection unit 29 inputs from the temperature sensor 17 side, detects whether the input temperature is equal to or higher than a certain level (50 ° C.), and In this case, a signal for turning on the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, and the temperature detection unit 29 inputs from the temperature sensor 17 side, and the input temperature is at a certain level. It is detected whether or not (40 ° C.) or less, and when it is below a certain level (40 ° C.), a signal for turning off the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, Although the inside of 5B is cooled by the cooling fan 20, the measured value (liquid crystal ambient temperature) of the temperature sensor installed in the vicinity of the LCD substrate 6A is the temperature detection value of the temperature sensor 17 from the experimental results. It is confirmed that the value is always lower than the time transition, and it is confirmed that the cooling fan 20 is properly turned ON / OFF based on the temperature value input from the temperature sensor 17 by the temperature detection unit 29, and the housing It was confirmed that the internal temperature of the main body 5B and the board material 5A can be controlled in a stable state.

On the other hand, as shown in the experimental results of FIG. 9, assuming that there is direct sunlight on the display device 1 and setting the temperature detection unit 29 as shown in the following c and e,
c. A constant level value (50 ° C.) that is set in the temperature detection unit 29 and outputs a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20.
e. A value of a certain level (40 ° C.) in the case where a signal for setting the cooling fan 20 to OFF is output to the drive control unit 23 of the cooling fan 20, which is set in the temperature detection unit 29.
Region where the LCD substrate 6A constituting the liquid crystal display unit 6 operates safely and exceeds the upper limit (70 ° C. or lower) of the temperature at which the liquid crystal or the like is not damaged (the liquid crystal operating temperature is surrounded by the broken line in FIG. 9) ) Can be confirmed by the measurement value of the temperature sensor installed in the vicinity of the LCD substrate 6A. That is, the experimental result of FIG. 9 is input from the temperature sensor 17 side by the temperature detection unit 29, detects whether or not the input temperature is equal to or higher than a certain level (50 ° C.), and exceeds the certain level (50 ° C.). In this case, a signal for turning on the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, and the temperature detection unit 29 inputs from the temperature sensor 17 side, and the input temperature is at a certain level. It is detected whether or not (40 ° C.) or less, and when it is below a certain level (40 ° C.), a signal for turning off the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, 5B relates to a configuration in which the cooling fan 20 is cooled, but the illuminance detection unit 30 in the controller 22 according to the above-described embodiment of the present invention is not intended to function intentionally. A signal for the down 20 and ON was decided not to output to the drive control unit 23. That is, from the experimental results of FIG. 9, the temperature detection unit 29 inputs from the temperature sensor 17 side, detects whether or not the input temperature is equal to or higher than a certain level (50 ° C.). In this case, a signal for turning on the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, and the temperature detection unit 29 inputs from the temperature sensor 17 side, and the input temperature is at a certain level. It is detected whether or not (40 ° C.) or less, and when it is below a certain level (40 ° C.), a signal for turning off the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, It turned out that control of the structure which cools the inside of 5B with the cooling fan 20 is inadequate.

Here, the inventors of the present application, from the experimental results of FIG.
A. The measurement value (liquid crystal ambient temperature) of the temperature sensor installed in the vicinity of the LCD substrate 6A is always higher than the temperature detection value of the temperature sensor 17. The temperature detection unit 29 is a region exceeding the upper limit (70 ° C. or lower) of the temperature at which the LCD substrate 6A operates safely and does not cause damage to the liquid crystal or the like (the region indicated as over liquid crystal operating temperature surrounded by a broken line in FIG. 9). Focusing on the point that exists before the cooling fan 20 is turned on based on the temperature value input from the temperature sensor 17 side, a series of control processes of the illuminance detection unit 30 in the controller 22 according to the present embodiment is performed. It is up to the invention. That is, based on the experimental result of FIG. 9 assuming that the display device 1 is irradiated with sunlight, in an environment where sunlight is irradiated, the temperature detection unit 29 inputs from the temperature sensor 17 side and is input. In the control of outputting a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20 when the temperature is equal to or higher than a certain level (50 ° C.), the main body 5B is rapidly increased by sunlight irradiation. It becomes impossible to cope with the temperature, and as soon as a conclusion is reached that a delay occurs in cooling the inside of the main body 5B. Therefore, the display device 1 includes the photo IC 16 according to the above-described embodiment that detects the irradiation state of light such as sunlight, and the illuminance detection unit 30 inputs from the photo IC 16 side, and the input illuminance is a certain level or more. When the level is equal to or higher than a certain level, the drive control unit 23 of the cooling fan 20 is controlled to turn on the cooling fan 20, whereby the LCD substrate 6A operates safely, and the liquid crystal or the like The control process shown in FIG. 10 that does not exceed the upper temperature limit (70 ° C. or lower) at which no damage occurs is invented.

That is, the experiment result shown in FIG. 10 assumes that the display device 1 has direct sunlight, and the temperature detection unit 29 is set as in the following c, d, and e.
c. A constant level value (50 ° C.) that is set in the temperature detection unit 29 and outputs a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20.
d. A value set at the temperature detection unit 29 and a value at a certain level when the drive circuit 24 is turned off to the lighting control unit 28 and a signal for turning off the operation of the LED display unit 7 or the liquid crystal display unit 6 is output ( 70 ° C),
e. A value of a certain level (40 ° C.) in the case where a signal for setting the cooling fan 20 to OFF is output to the drive control unit 23 of the cooling fan 20, which is set in the temperature detection unit 29.

The illuminance detection unit 30 and the drive control unit 23 were also set as follows.
a. A value of a fixed time (60 seconds) set by the drive control unit 23 and measured by the timer 32 (time measuring circuit),
b. A constant level value (70,000 lx) that is set in the illuminance detection unit 30 and outputs a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20.

As a result, in the case shown in FIG. 10, the cooling fan 20 operates safely on the LCD substrate 6A that constitutes the liquid crystal display unit 6 as shown in FIG. ), The illuminance detection unit 30 promptly detects the value of the illuminance level (70,000 lx) applied to the display device 1 in the previous stage of the region exceeding the region (the region indicated by the liquid crystal operating temperature over surrounded by the broken line in FIG. This state was confirmed by the measured value of the temperature sensor installed in the vicinity of the LCD substrate 6A (time transition of the liquid crystal ambient temperature). Thereafter, as in the case of FIG. 9, the temperature detection unit 29 inputs from the temperature sensor 17 side, detects whether or not the input temperature is equal to or higher than a certain level (50 ° C.), and reaches a certain level (50 ° C.). In the above case, a signal for turning on the cooling fan 20 is output to the drive control unit 23 of the cooling fan 20, and the control of the normal temperature detection unit 29 that cools the inside of the main body 5B by the cooling fan 20 is performed. It was confirmed by the measured value of the temperature sensor 17 (thermistor sensor ambient temperature) that it can cope with the execution. Therefore, based on the following b, it is considered that the control for executing the driving of the cooling fan 20 is sufficient in the range of the constant rise time in which the photo IC 16 measures the first intense sunlight incidence. The ON / OFF control of the cooling fan 20 is executed including the point of the drive control unit 23 of a.
a. A value of a fixed time (60 seconds) set by the drive control unit 23 and measured by the timer 32 (time measuring circuit),
b. A constant level value (70,000 lx) that is set in the illuminance detection unit 30 and outputs a signal for turning on the cooling fan 20 to the drive control unit 23 of the cooling fan 20.

As a result, as shown in FIG. 10, the cooling fan 20 is driven in a stable state by the control process of the controller 22 including the illuminance detection unit 30, and the sunlight is directly applied to the display device 1 for a certain time. In the process in which the LCD substrate 6A passes, the measured value of the temperature sensor installed in the vicinity of the LCD substrate 6A (time transition of the liquid crystal ambient temperature) is 70 ° C. or less where the LCD substrate 6A operates safely and does not damage the liquid crystal or the like. It became possible to always maintain the temperature state.

The control process of the controller 22 of the display device 1 according to the above embodiment can be executed based on the flowchart shown in FIG. 6 or FIG.

  First, a process for setting the temperature detection unit 29 to turn off the drive circuit 24 for the lighting control unit 28 and turn off the operation of the LED display unit 7 or the liquid crystal display unit 6 is based on the flowchart of FIG. explain. First, in step A of FIG. 6, is the temperature detected by the temperature detector 29 equal to or higher than a certain level (70 ° C.)? When the determination result is YES, as shown in step B, the lighting control unit 28 performs control to turn off the drive circuit 24 and turn off the operation of the LED display unit 7 or the liquid crystal display unit 6. On the other hand, in step A of FIG. 6, it is determined whether or not the temperature detected by the temperature detector 29 is equal to or higher than a certain level value (70 ° C.). If the determination result is NO, in step C of FIG. As shown, the lighting control unit 28 can keep the drive circuit 24 in the ON state and keep the operation of the LED display unit 7 or the liquid crystal display unit 6 in the ON state.

  Next, a control process for turning on / off the driving of the cooling fan 20 in the drive control unit 23 based on the detection value of the illuminance detection unit 30 and the detection value of the temperature detection unit will be described based on the flowchart of FIG. . First, in step A of FIG. 7, the illuminance detection unit 30 determines whether or not the detected illuminance is a certain level value (70,000 lx) or more and detects an illuminance that is a certain level value (70,000 lx) or more. Has 60 seconds passed since Is determined. If the determination result here is YES, as shown in step B, the drive signal to the cooling fan 20 in the drive control unit 23 is turned ON, and the cooling fan 20 is driven.

On the other hand, if the determination result here is NO, is the temperature detected by the temperature detection unit 29 in step C of FIG. 7 equal to or higher than a certain level (50 ° C.)? Perform the determination. If the determination result here is YES, as shown in step D, the drive signal to the cooling fan 20 in the drive control unit 23 is turned ON, and the cooling fan 20 is driven.

On the other hand, if the determination result is NO, is the temperature detected by the temperature detection unit 29 in step E of FIG. 7 equal to or lower than a certain level value (40 ° C.)? Perform the determination. If the determination result here is NO, as shown in step F, the drive signal to the cooling fan 20 in the drive control unit 23 remains ON, and the cooling fan 20 is continuously driven.

  On the other hand, when the determination result here is YES, as shown in step G of FIG. 7, the drive control unit 23 turns off the drive signal to the cooling fan 20 and stops the driving of the cooling fan 20.

  By repeatedly executing the control flows shown in FIGS. 6A to 6C and FIGS. 7A to 7G, when the display device 1 is installed, for example, outdoors or near a sunny window, the display device 1 is suddenly applied. It is possible to cope with the case where intense sunlight is radiated or when the sun suddenly falls, and the board material 5A or the main body 5B as a housing and the electronic parts inside thereof, particularly the liquid crystal display portion that is vulnerable to heat. 6 can be cooled appropriately and its function can be maintained.

  In the above-described embodiment, the liquid crystal display unit 6 and the LED display unit 7 as display bodies are provided on the surface of the board material 5A on the surface of the display device 1, and the drive circuit 24 that drives these is provided in the controller according to the above-described embodiment. The drive is controlled by 22 control processes. However, the present invention is not limited to such a configuration in which the liquid crystal display unit 6 and the LED display unit 7 are provided side by side, and the control process of the controller 22 according to the above embodiment is employed in a display device including only the liquid crystal display unit. You may make it make it.

  According to the present invention, it is possible to provide a display device including a liquid crystal display unit that can be used with confidence even at an indoor window or outdoors exposed to direct sunlight. For this reason, a display device including a liquid crystal display unit can be installed even in a high-temperature environment such as outdoors or indoor windows that are exposed to a lot of direct sunlight. Thereby, in the liquid crystal display part of the display device installed in such a place, for example, information on the store can be notified to a passerby or the like in more detail. Therefore, for example, information such as “today's recommended products”, “cooking scenery”, and “food supply locations” at restaurants can be provided to passersby in detail in real time using images and video on the liquid crystal display. , It can be expected to improve the ability to attract customers and increase sales.

1: Display device 2: Caster 3: Base 4: Pole 5A: Main body (housing)
5B: Board material (housing)
6: Liquid crystal display unit 6A: LCD substrate 7: LED display unit 7A: LED substrate 8: Connection code 8A: Terminal 9: Power supply 10: Earth 11, 12: Bracket 13: Circuit substrate 14: Light receiving device 14A: Light receiving device substrate 15A, 15B: Light receiving unit 16: Photo IC (photo sensor)
17: Temperature sensor 18: Intake port 19: Exhaust port 20: Cooling fan 21: Exhaust duct 22: Controller 23: Drive control unit 24: Drive circuit 25: Input device 26: Memory 27: Recorder 28: Lighting control unit 29: Temperature Detection unit 30: Illuminance detection unit 31: A / D converter 32: Timer

Claims (11)

A liquid crystal display unit capable of displaying an image or an image on the surface thereof is disposed on one surface of the casing, and a display body that can be installed indoors or outdoors in a state in which the one surface is directed to a viewer; ,
The display body includes a cooling fan capable of cooling the liquid crystal display unit, and the display device includes:
The casing of the display body includes a temperature sensor that measures the temperature in the casing in which the liquid crystal display unit is disposed, and a photosensor that measures the illuminance of light irradiated on the display body.
In the housing of the display body, a drive control unit that controls ON / OFF driving of the cooling fan, a drive circuit that drives the liquid crystal display unit, and can display an arbitrary video or image on the liquid crystal display unit, A controller that includes a lighting control unit that enables the drive circuit to be turned on and off and the operation of the liquid crystal display unit to be turned on and off;
In addition, the controller
Inputs the illuminance measured by the photo sensor, detects whether the input illuminance is above a certain level, and turns on the cooling fan for the cooling fan drive control unit when it is above a certain level An illuminance detector that outputs a signal;
Input the temperature measured by the temperature sensor, detect if the input temperature is above a certain level, and turn on the cooling fan for the cooling fan drive control unit if it is above a certain level A temperature detector that outputs a signal;
A display device comprising: A plurality of LED light emitting elements arranged in a plane, each LED light emitting element is arbitrarily turned on, and an LED display unit capable of displaying information on the surface; and a liquid crystal display unit capable of displaying an image or an image on the surface; And a display body that can be installed indoors or outdoors as a state in which the one surface is directed to a viewer,
The display body includes a cooling fan that can cool the LED display unit and the liquid crystal display unit.
The housing of the display body is provided with a temperature sensor that measures the temperature in a box that is provided with an LED display unit and a liquid crystal display unit, and a photosensor that measures the illuminance of light irradiated on the display body,
In the casing of the display body, a drive control unit that controls ON / OFF driving of the cooling fan, an LED display unit, and a liquid crystal display unit are driven, and each LED light emitting element of the LED display unit is arbitrarily turned on to be on the surface. A drive circuit that can display arbitrary information or display an arbitrary video or image on the liquid crystal display unit, and the drive circuit can be turned on / off, and the operation of the LED display unit or the liquid crystal display unit is turned on / off. A lighting controller capable of being provided with a controller,
In addition, the controller
Inputs the illuminance measured by the photo sensor, detects whether the input illuminance is above a certain level, and turns on the cooling fan for the cooling fan drive control unit when it is above a certain level An illuminance detector that outputs a signal;
Input the temperature measured by the temperature sensor, detect if the input temperature is above a certain level, and turn on the cooling fan for the cooling fan drive control unit if it is above a certain level A temperature detector that outputs a signal;
A display device comprising: The temperature detection unit of the controller inputs the temperature measured by the temperature sensor, detects whether or not the input temperature is below a certain level, and when the temperature is below the certain level, to the drive control unit of the cooling fan The display device according to claim 1, wherein a signal for turning off the cooling fan is output. The temperature detection unit of the controller inputs the temperature measured by the temperature sensor, detects whether the input temperature is equal to or higher than a certain level, and if it is equal to or higher than a certain level, drives the drive circuit to the lighting control unit. The display device according to claim 1, wherein a signal for turning off the liquid crystal display unit is output. The temperature detection unit of the controller inputs the temperature measured by the temperature sensor, detects whether the input temperature is equal to or higher than a certain level, and if it is equal to or higher than a certain level, drives the drive circuit to the lighting control unit. The display device according to claim 2, wherein a signal for turning off the LED display unit and the liquid crystal display unit is output. The drive control unit of the cooling fan in the controller inputs a signal for turning on the cooling fan from the illuminance detection unit, and after the input, turns on the cooling fan within a predetermined time measured by the timer, A signal for turning on the cooling fan is input from the illuminance detection unit, and after the input, a control for turning off the cooling fan is executed after a lapse of a fixed time measured by the timer. The display device according to any one of 5. The illuminance detection unit inputs from the photo sensor, detects whether or not the input illuminance is above a certain level, and turns on the cooling fan for the cooling fan drive control unit when it is above a certain level The display device according to claim 1, wherein a value of a certain level when a signal for output is output is a value of a level of 70,000 lx or more. The temperature detection unit receives an input from a temperature sensor, detects whether or not the input temperature is above a certain level, and turns on the cooling fan with respect to the cooling fan drive control unit when the temperature is above a certain level. 3. The display device according to claim 1, wherein a value at a certain level when a signal for outputting is set to an arbitrary value in a range of 50 ° C. or less to room temperature. The temperature detection unit receives an input from a temperature sensor, detects whether the input temperature is below a certain level, and turns the cooling fan off with respect to the cooling fan drive control unit when the temperature is below a certain level. The display device according to claim 3, wherein a value at a certain level when a signal for outputting is set to an arbitrary value in a range from 40 ° C. or lower to room temperature. In the temperature detection unit, an input from a temperature sensor is detected, and whether or not the input temperature is equal to or higher than a certain level is detected. When the temperature is higher than a certain level, the drive circuit is turned off for the lighting control unit, and the liquid crystal display unit The display device according to claim 4, wherein a value at a certain level when outputting a signal for turning off the operation of is an arbitrary value in a range from 70 ° C. or less to room temperature. In the temperature detection unit, an input from a temperature sensor is detected, and it is detected whether or not the input temperature is above a certain level. If the temperature is above a certain level, the drive circuit is turned off for the lighting control unit, and the LED display unit The display device according to claim 5, wherein the value at a certain level when outputting a signal for turning off the operation of the liquid crystal display unit is an arbitrary value in a range from 70 ° C. or less to room temperature.

Images