WO2021241848A1

WO2021241848A1 - Display apparatus and display system

Info

Publication number: WO2021241848A1
Application number: PCT/KR2021/002067
Authority: WO
Inventors: 김중근; 서서이; 나현택
Original assignee: 삼성전자주식회사
Priority date: 2020-05-25
Filing date: 2021-02-18
Publication date: 2021-12-02
Also published as: KR20210145412A

Abstract

A disclosed display apparatus according to an aspect comprises: a cooling fan comprising a motor; a pulse detection unit that detects a pulse signal output from the motor by the rotation of the cooling fan and counts the number of high pulses in the pulse signal; and a control unit that calculates the pulse frequency of the pulse signal on the basis of the number of high pulses, determines a level to which the pulse frequency belongs from among pre-stored levels for respective frequency ranges, and when the level of the pulse frequency deviates from a predetermined level, determines that an error has occurred with respect to the cooling fan.

Description

Display devices and display systems

The disclosed invention relates to a display system. Specifically, it relates to a display system for detecting an error in a cooling fan of a display device.

A display device is an output device that provides visual image information to a user, and is installed in various places such as indoors or outdoors and is used for various purposes. In this case, when the display device is used outdoors, there is a possibility of malfunction due to the inflow of foreign substances such as sunlight, wind, moisture, and dust, so a countermeasure for this is required.

The outdoor display device adopts a cooling method using a fan in order to solve the above-described problem, and detects a PWM (Pulse Width Modulation) voltage signal output from the fan to detect an error of the fan. However, in this cooling method, it is difficult to accurately detect an operation error of the fan due to the nature of the outdoor environment.

For example, the PWM voltage signal may be generated due to rotation of the fan by external wind even when the fan is broken, thus causing a false sense.

SUMMARY One aspect of the disclosed invention is to provide a display device and a display system that can accurately detect an error of a cooling fan without being affected by an outdoor environment.

A display device according to an aspect of the disclosed invention includes a cooling fan including a motor; a pulse detection unit detecting a pulse signal output from the motor by rotation of the cooling fan and counting the number of high pulses in the pulse signal; and calculating the pulse frequency of the pulse signal based on the number of high pulses, determining which level the pulse frequency belongs to among previously stored levels for each frequency section, and when the level of the pulse frequency deviates from a predetermined level and a control unit that determines that an error in the cooling fan has occurred.

The control unit may calculate the pulse frequency based on the number of high pulses counted in a predetermined period of the pulse signal and assign a level corresponding to the pulse frequency.

The display apparatus according to an embodiment further includes a temperature detection unit sensing an internal temperature of the display apparatus, wherein the control unit controls the cooling fan to be driven at a rotation speed corresponding to the internal temperature, and the sensing When the level of the pulse frequency is lower than the level of the pulse frequency corresponding to the rotation speed, it may be determined that an error of the cooling fan has occurred.

The pulse sensing unit may detect a pulse voltage output by rotation of the cooling fan, and the control unit may determine that an error of the cooling fan has occurred when the pulse voltage is a predetermined voltage value.

The control unit may include, wherein the predetermined voltage value is a pulse voltage having a high level or a low level, the sensed pulse frequency deviates from a predetermined level, or the pulse voltage is a predetermined voltage value In this case, it may be determined that an error in the cooling fan has occurred.

The display apparatus according to an embodiment may further include a communication unit configured to communicate with an external server, and the control unit may control the communication unit to transmit the determination result to the server when an error in the cooling fan occurs. .

The control unit controls the power supply of the display device to turn on/off the cooling fan, and transmits the determination result to the server if an error occurs in the cooling fan while the cooling fan is on/off. can be controlled

The control unit controls the power supply unit of the display device so that the rotation speed of the cooling fan is maximized, and when an error of the cooling fan occurs while the cooling fan is driven, a communication unit to transmit the determination result to the server can be controlled

The controller may determine a level corresponding to the sensed pulse frequency while the cooling fan is being driven, and if the determined level is less than a predetermined level, determine that an error in the cooling fan has occurred.

When the number of the cooling fans is plural, the controller may control the communication unit to transmit location information of the cooling fan in which an error has occurred to the server.

A method of controlling a display apparatus according to an aspect of the disclosed invention includes a cooling fan provided with a motor, detects a pulse signal output from the motor by rotation of the cooling fan, and receives a high pulse (HIGH PULSE) from the pulse signal. ) to count the number of; and calculating the pulse frequency of the pulse signal based on the number of high pulses, determining which level the pulse frequency belongs to among previously stored levels for each frequency section, and when the level of the pulse frequency deviates from a predetermined level It is determined that an error in the cooling fan has occurred.

Determining that an error of the cooling fan has occurred may include calculating the pulse frequency based on the number of high pulses counted in a predetermined period of the pulse signal and assigning a level corresponding to the pulse frequency.

The method of controlling a display device according to an embodiment further includes detecting an internal temperature of the display device, and determining that an error of the cooling fan has occurred may include rotating the cooling fan corresponding to the internal temperature. It is controlled to be driven at a speed, and when the level of the sensed pulse frequency is lower than the level of the pulse frequency corresponding to the rotation speed, it may be determined that an error of the cooling fan has occurred.

The method of controlling a display apparatus according to an embodiment further includes detecting a pulse voltage output by rotation of the cooling fan, and determining that an error of the cooling fan has occurred may include determining that the pulse voltage is predetermined. If it is a voltage value, it may be determined that an error has occurred in the cooling fan.

Determining that an error of the cooling fan has occurred is that the predetermined voltage value is a pulse voltage having a high level or a low level, and the sensed pulse frequency deviates from the predetermined level, When the pulse voltage is a predetermined voltage value, it may be determined that an error in the cooling fan has occurred.

A method of controlling a display apparatus according to an embodiment includes performing communication with an external server; and when an error in the cooling fan occurs, transmitting the determination result to the server.

Determining that the cooling fan error has occurred is controlling the power supply of the display device so that the cooling fan is turned on/off, and when the cooling fan error occurs while the cooling fan is turned on/off, the determination result may be transmitted to the server.

Determining that an error of the cooling fan has occurred is controlling the power supply of the display device so that the rotation speed of the cooling fan is maximized, and when an error of the cooling fan occurs while the cooling fan is being driven, the determination result may be transmitted to the server.

Determining that the cooling fan error has occurred is determining a level corresponding to the sensed pulse frequency while the cooling fan is being driven, and when the determined level is less than a predetermined level, it is determined that the cooling fan error has occurred can judge

Determining that an error in the cooling fan has occurred may include transmitting location information of the cooling fan in which the error has occurred to the server when the number of the cooling fans is plural.

According to one aspect of the disclosed invention, it is possible to accurately detect an error of the cooling fan even in an outdoor environment.

1 shows a display system according to an embodiment.

2 illustrates a configuration of a display device according to an exemplary embodiment.

3 illustrates a connection relationship between a display and a server according to an exemplary embodiment.

4 shows the pulses sensed by the cooling fan.

5 shows a level table for each frequency section referenced in an embodiment.

6 is a control flowchart between a display device and a server according to an exemplary embodiment.

7 is a flowchart of a method for controlling a display apparatus according to an exemplary embodiment.

8 is a flowchart of a method for controlling a server according to an exemplary embodiment.

Like reference numerals refer to like elements throughout. This specification does not describe all elements of the embodiments, and general content in the technical field to which the disclosed invention pertains or content overlapping between the embodiments is omitted. The term 'part, module, member, block' used in this specification may be implemented in software or hardware, and according to embodiments, a plurality of 'part, module, member, block' may be implemented as one component, It is also possible for one 'part, module, member, block' to include a plurality of components.

Throughout the specification, when a part is "connected" to another part, it includes not only a direct connection but also an indirect connection, and the indirect connection includes connection through a wireless communication network. do.

In addition, when a part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

Throughout the specification, when a member is said to be located "on" another member, this includes not only a case in which a member is in contact with another member but also a case in which another member exists between the two members.

Terms such as 1st, 2nd, etc. are used to distinguish one component from another component, and the component is not limited by the above-mentioned terms.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In each step, the identification code is used for convenience of description, and the identification code does not describe the order of each step, and each step may be performed differently from the specified order unless the specific order is clearly stated in the context. have.

Hereinafter, embodiments according to the disclosed invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a display system according to an embodiment, FIG. 2 shows a configuration of a display device according to an embodiment, and FIG. 3 shows a connection relationship between a display and a server according to an embodiment.

Referring to FIG. 1 , a display system 1 may include a display device 100 that visually displays an image and a server 200 that communicates with the display device 100 . The display apparatus 100 may visually display an image based on content data stored therein, or may visually display an image based on content data provided from the server 200 . Here, the content data may include at least one of video data providing visual information and audio data providing auditory information.

The display device 100 may be a large format display (LFD) installed outdoors, such as on the roof of a building or at a bus stop. Here, the outdoors is not necessarily limited to the outdoors, and the display apparatus 100 according to an embodiment may be installed as long as it is a place where a large number of people can enter, even if it is indoors, such as a subway station, a shopping mall, a movie theater, a company, or a store.

The display apparatus 100 may be implemented as a single display as shown in FIG. 1 or may be implemented as videowalls through a plurality of displays arranged in alignment with a row and a column. In other words, the plurality of displays may be arranged in a matrix form.

A video wall including a plurality of displays may integrally form one screen (S). In other words, the video wall may display one image integrally.

The display apparatus 100 includes a cooling fan 181 that radiates heat or cools components installed therein. The cooling fan 181 may dissipate heat generated by the display device 100 itself or cool heat generated by external solar heat. Specifically, when power is supplied, the cooling fan 181 drives the fan with the supplied power to cool various components inside the display device to prevent overheating.

The cooling fan 181 includes a fan (not shown) that generates wind by rotation and a motor (not shown) that provides driving force to the fan. In addition, the cooling fan 181 may include an analog-to-digital converter (ADC) that converts a voltage signal (or a current signal) output from the motor by rotation into a pulse signal by PWM (Pulse Width Modulation). .

At least one cooling fan 181 may be provided in the display apparatus 100 . When a plurality of cooling fans 181 are provided, at least one of the plurality of cooling fans may be disposed at the top, middle, and bottom of the display device 100, or may be divided into a cooling fan for betting and a cooling fan for outdoor air. .

The cooling fan 181 generates a pulse signal by rotation of the fan, wherein the pulse signal includes a PWM (Pulse Width Modulation) voltage signal (current signal). The controller 140 may detect an error in the cooling fan 181 based on at least one of a pulse frequency or a pulse voltage of a pulse signal generated by rotation of the fan.

The display apparatus 100 may include a main body 100a accommodating a plurality of parts for displaying an image, and a screen 100b provided on one side of the main body 100a to display an image.

The main body 100a forms the exterior of the display apparatus 100 , and parts for the display apparatus 100 to display an image may be provided inside the main body 100a. The body 100a shown in FIG. 1 has a flat plate shape, but the shape of the body 100a is not limited to that shown in FIG. 1 . For example, the main body 100a may have a curved shape such that both left and right ends protrude forward and the center is concave.

The screen 100b is formed on the front surface of the main body 100a, and an image that is visual information may be displayed on the screen 100b. For example, a still image or a moving image may be displayed on the screen 100b, and a 2D flat image or a 3D stereoscopic image may be displayed.

A plurality of pixels P are formed on the screen 100b, and the image I displayed on the screen 100b may be formed by a combination of light emitted from the plurality of pixels P. For example, one image may be formed on the screen 100b by combining the light emitted by the plurality of pixels P like a mosaic.

Each of the plurality of pixels P may emit light of various brightnesses and of various colors.

In order to emit light of various brightnesses, each of the plurality of pixels P includes a configuration that can directly emit light (eg, a light emitting diode or an organic light emitting diode) or transmits light emitted by a backlight unit, etc. It may include a configuration that can be turned on or off (eg, a backlight unit and a liquid crystal panel).

In order to emit light of various colors, each of the plurality of pixels P may include sub-pixels P _R , P _G , and P _B .

The sub-pixels P _R , P _G , and P _B are a red sub-pixel P _R capable of emitting red light, a green sub-pixel P _G capable of emitting green light, and a blue light emitting device. It may include a capable blue sub-pixel P _B . For example, red light may refer to light with a wavelength of approximately 620 nm (nanometer, billionths of a meter) to 750 nm, green light may refer to light having a wavelength of approximately 495 nm to 570 nm, and blue light may represent light with a wavelength of approximately 495 nm to 570 nm. It can represent light with a wavelength of approximately 450 nm to 495 nm.

By the combination of the red light of the red sub-pixel P _R , the green light of the green sub-pixel P _G , and the blue light of the blue sub-pixel P _B , each of the plurality of pixels P has various brightnesses and different colors. light can be emitted.

The screen 100b shown in FIG. 1 has a flat plate shape, but the shape of the screen 100b is not limited to that shown in FIG. 1 . For example, depending on the shape of the main body 100a, the screen 100b may have a curved shape such that the left and right ends protrude forward and the center is concave.

The screen 100b is a liquid crystal display panel (Liquid Crystal Display Panel, LCD Panel), a light emitting diode panel (Light Emitting Diode Panel, LED Panel), or an organic light emitting diode panel (Organic Light Emitting Diode Panel, OLED Panel) of various types. It may be implemented by a display panel.

The server 200 is connected to the display apparatus 100 through a network to monitor the operating state of a cooling fan driven in the display apparatus 100 . The server 200 may receive the error determination result of the control unit 140 of the display device 100, and when a failure of the cooling fan 200 occurs, a notification and call for service response may be performed to solve the failure. have.

The display apparatus 100 includes a user input unit 110 that receives a user input from a user, a temperature sensor 120 that detects an internal temperature of the display apparatus 100 and/or a temperature of various components, and a server 200 . ) and/or a communication unit 130 that communicates with an external device, and a control unit 140 that controls the operation of the display device 100 and processes the video signal and/or audio signal received by the communication unit 130; Power is supplied to the components of the image display unit 150 for displaying the image processed by the control unit 140 , the sound output unit 160 for outputting the sound processed by the control unit 140 , and the display apparatus 100 . It includes an error detection unit 180 for detecting an error of the power supply unit 170 to supply and the cooling fan 181 .

The user input unit 110 may include an input button group 111 for receiving a user input. For example, the user input unit 110 may include a power button for turning on or off the display apparatus 100 , a channel selection button for selecting broadcast content displayed on the display apparatus 100 , and an output of the display apparatus 100 . It may include a sound control button for adjusting the volume of the sound to be played, a source selection button for selecting a content source, and the like. In addition, the user input unit 110 may further include a cooling fan on/off button for determining whether the cooling fan 181 operates normally, and a foreign material removal button for outputting the cooling fan 181 at maximum speed to remove foreign substances. can

The input button group 111 may each receive a user input and output an electrical signal corresponding to the user input to the controller 140 , and may be configured by various input means such as a push switch, a touch switch, a dial, a slide switch, and a toggle switch. can be implemented.

The user input unit 110 also includes a signal receiver 112 for receiving a remote control signal of the remote controller (112a). The remote controller 112a for receiving the user input may be provided separately from the display apparatus 100 , and may receive the user input and transmit a wireless signal corresponding to the user input to the display apparatus 100 . The signal receiver 112 may receive a wireless signal corresponding to a user input from the remote controller 112a and output an electrical signal corresponding to the user input to the controller 140 .

The temperature sensing unit 120 may detect an internal temperature of the display apparatus 100 and/or a temperature of various components, and may provide the sensed temperature value to the control unit 140 . The temperature sensing unit 120 may be a temperature sensor, a thermistor (Thermistor), such as various sensors for sensing the temperature. The controller 140 may determine whether the display apparatus 100 is in an overheated state based on the temperature value obtained from the temperature sensor 120 . If the display apparatus 100 is in an overheated state, the controller 140 may transmit a control signal to the cooling fan 181 to drive the cooling fan 181 so that the display apparatus 100 can reach a normal temperature. .

The communication unit 130 may communicate with the server 200 and/or an external device. The communication unit 130 may receive a video/audio signal from the server 200 . The communication unit 130 may transmit the error detection result of the cooling fan 181 determined by the control unit 140 to the server 200 . In addition, the communication unit 130 may receive a control command corresponding to the error detection from the server, and transmit the control command to the control unit 140 so that the cooling fan 181 operates accordingly. For example, the communication unit 130 may receive a control command transmitted from an external device (eg, a computing device) connected to the server 200 through a network.

The communication unit 130 may include a wired communication module 131 and a wireless communication module 132 that can exchange data with the server 200 and/or an external device.

The wired communication module 131 may connect to a communication network through a cable, and may exchange data with the image source device 20 and/or an external device through the communication network. For example, the wired communication module 131 may connect to a communication network through Ethernet (Ethernet, IEEE 802.3 technical standard), and may exchange data with the server 200 and/or an external device through the communication network.

The wireless communication module 132 may communicate with an access point (AP) wirelessly, access a communication network through the access point (AP), and exchange data with the server 200 and/or an external device through the communication network. . For example, the wireless communication module 132 is accessed via Wi-Fi (WiFi, IEEE 802.11 technology standard), Bluetooth (Bluetooth, IEEE 802.15.1 technology standard), ZigBee (ZigBee, IEEE 802.15.4 technology standard) It can communicate with the point (AP), and can exchange data with the server 200 and/or an external device through the access point (AP).

The controller 140 may process image frame data and/or video/audio signals received by the communication unit 130 . For example, the controller 140 may process the video/audio signal received by the communication unit 130 , and output image frame data generated from the video/audio signal to the image display unit 150 .

The controller 140 may include a microprocessor 141 and a memory 142 . The memory 142 may store programs and data for processing image frame data and/or video/audio signals, and may temporarily store data issued while processing image frame data and/or video/audio signals. In addition, the memory 142 may store programs and data for controlling the components included in the display apparatus 100 , and temporarily store data issued while controlling the components included in the display apparatus 100 .

The memory 142 includes a non-volatile memory such as a read only memory and a flash memory for storing data for a long period of time, and a static random access memory (S-RAM) and D-RAM for temporarily storing data. It may include a volatile memory such as a dynamic random access memory (RAM).

The microprocessor 141 may receive image frame data and/or a video/audio signal from the communication unit 130 . The microprocessor 141 may output the image frame data received from the content receiving unit 120 to the image display unit 150 and the sound output unit 160 . In addition, the microprocessor 141 may decode the video signal to generate image frame data, decode the audio signal and generate sound data, and display the image frame data and the sound data respectively to the image display unit 150 and the sound output unit. (160) can be output.

The microprocessor 141 may receive a user input from the user input unit 110 and may generate a control signal for controlling the image display unit 150 and/or the sound output unit 160 .

The microprocessor 141 may include an arithmetic circuit that performs logical operations and arithmetic operations, and a memory circuit that stores the calculated data.

The image display unit 150 includes a display panel 142 that visually displays an image, and a display driver 141 that drives the display panel 142 .

The display panel 142 may generate an image according to the image data received from the display driver 141 and display the image.

The display panel 142 may include pixels serving as a unit for displaying an image. Each pixel may receive an electrical signal representing an image from the display driver 141 and output an optical signal corresponding to the received electrical signal. In this way, one image may be displayed on the display panel 142 by combining optical signals output from a plurality of pixels.

The display driver 141 may receive image data from the controller 140 and drive the display panel 142 to display an image corresponding to the received image data. Specifically, the display driver 141 may transmit an electrical signal corresponding to image data to each of a plurality of pixels constituting the display panel 142 .

When the display driver 141 transmits an electrical signal corresponding to image data to each pixel constituting the display panel 142, each pixel outputs light corresponding to the received electrical signal, and each pixel Lights may be combined to form one image.

The sound output unit 160 includes an amplifier 161 for amplifying sound and a speaker 162 for aurally outputting the amplified sound.

The controller 140 may convert sound data decoded from the audio signal into an analog sound signal, and the amplifier 161 may amplify the analog sound signal output from the controller 140 .

The speaker 162 may convert the analog sound signal amplified by the amplifier 181 into sound (sound wave). For example, the speaker 182 may include a thin film vibrating according to an electrical acoustic signal, and sound waves may be generated by the vibration of the thin film.

The power supply unit 170 includes a user input unit 110 , a temperature sensing unit 120 , a communication unit 130 , a control unit 140 , an image display unit 150 , a sound output unit 160 , an error sensing unit 160 and its It can supply power to all components outside.

The power supply unit 170 includes a switching mode power supply (Switching Mode Power Supply) 171 (hereinafter referred to as 'SMPS').

The SMPS 171 may include an AC-DC converter that converts AC power from an external power source into DC power, and a DC-DC converter that changes the voltage of DC power. For example, AC power from an external power source is converted into DC power by the AC-DC converter, and the voltage of the DC power may be changed to various voltages (eg, 5V and/or 15V) by the DC-DC converter. have. The DC power of which the voltage is changed is applied to the user input unit 110 , the temperature sensing unit 120 , the control unit 140 , the image display unit 150 , the sound output unit 160 , the error detection unit 180 and all other components, respectively. can be supplied to

The power supply unit 170 may control the power supply so that the rotation speed of the cooling fan 181 is adjusted based on the control signal of the control unit 140 . For example, the power supply unit 170 may control the cooling fan to be turned off by blocking power supplied to the cooling fan 181 . In addition, the power supply unit 170 may supply power to drive the cooling fan 181 in an off state, and may control the rotation speed of the cooling fan 181 by adjusting the power supply amount. Also, the power supply unit 170 may maximize the amount of power supplied to the cooling fan 181 to control the rotation speed of the cooling fan 181 to be the maximum.

A configuration in which the display apparatus 100 according to an exemplary embodiment detects an error of the cooling fan 181 and an operation by the configuration will be described in more detail with reference to FIGS. 4 and 6 with reference to FIG. 3 . 4 shows a pulse sensed by a cooling fan, and FIG. 5 shows a level table for each frequency section referenced in an embodiment.

The error detection unit 180 detects the pulse signals output from the plurality of cooling fans 181-1, 181-2, 181-3 and the plurality of cooling fans 181-1, 181-2, 181-3. It may include a pulse sensing unit 182 . As already described, the cooling fan 181 may include a plurality of cooling fans 181-1, 181-2, and 181-3. In this case, the pulse sensing unit 182 may receive at least one of a pulse voltage or a pulse frequency from each of the plurality of cooling fans 181-1, 181-2, and 181-3.

The control unit 140 is connected to the error detection unit 180 by an I2C (Inter Integrated Circuit), which is a bidirectional serial bus, to transmit/receive various data output from the plurality of cooling fans 181-1, 181-2, and 181-3. can do. For example, the controller 140 may receive a pulse frequency, a pulse amplitude, etc. of a pulse signal of the cooling fan, and may receive a level corresponding to a pulse frequency to be described later. In addition, when the control unit 140 is configured with a plurality of cooling fans 181-1, 181-2, and 181-3, it may receive location information of the cooling fan 181 from which a pulse signal is generated through I2C together. .

The server 200 may receive an error determination result of the controller 140 of the display apparatus 100 .

Referring to FIG. 6 , the cooling fan 181 may output a pulse signal having a constant duty cycle by rotation. In this case, the pulse signal may be a pulse voltage (or pulse current) of a high pulse and a low pulse. The pulse signal may be a PWM signal having a constant duty cycle and a specific period. For example, the pulse signal output from the cooling fan 181 may have a duty cycle of 50% and a cycle value of 20 ms. The period of the pulse signal may be changed according to the rotation speed of the cooling fan 181 . For example, the period of the pulse signal may have a smaller value as the rotation speed of the cooling fan 181 increases, and as the period has a smaller value, the number of high pulses counted in a certain section increases.

The number of high pulses may have a different value according to a voltage signal (or a current signal) output from the motor. The number of high pulses may be determined by at least one of the electric power provided to the motor by the power supply unit 170 and the wind force applied to the fan by external wind. That is, the number of high pulses may depend on the output of the motor generated as the fan rotates.

The pulse detection unit 182 detects a pulse signal output from the motor by the rotation of the cooling fan 181 , and counts the number of high pulses in the pulse signal. In this case, the counted high pulses may be limited to those belonging to a predetermined section of the pulse signal, and the number of high pulses in the predetermined section may reflect the rotational speed of the cooling fan 181 rotating in real time.

Also, the pulse detector 182 may detect the amplitude of the pulse signal based on the pulse signal output from the cooling fan 181 .

The cooling fan 181 may output a pulse signal having a specific pulse frequency according to the rotation speed. In this case, the pulse frequency of the cooling fan 181 may be calculated based on the number of high pulses counted by the pulse detecting unit 182 . The pulse detector 182 may detect a pulse frequency in which the rotation speed of the cooling fan 181 is reflected by counting the duty of the pulse signal.

As described above, the pulse frequency may have various values according to the rotation speed of the cooling fan 181 . Using this characteristic, the controller 140 may determine the rotation speed of the cooling fan 181 based on the pulse frequency, and through this, determine whether the cooling fan 181 operates normally or an error occurs.

The controller 140 may refer to the level table shown in FIG. 5 to determine whether the cooling fan 181 operates normally or an error occurs. The memory 142 may store a level table determined according to the specification of the display apparatus 100 . However, the level table shown in FIG. 5 is only one example for explaining an embodiment of the disclosed invention, and it goes without saying that it may have various sections.

As shown in FIG. 5 , 11 levels may be classified according to the interval of the pulse frequency, and each level may be proportional to the rotation speed of the cooling fan 181 . According to an embodiment, when the pulse frequency of the cooling fan 181 is detected through the pulse detecting unit 180 , the control unit 140 determines a frequency section to which the sensed pulse frequency belongs and determines the operating state of the cooling fan 181 . level can be assigned. At this time, when the given level deviates from the predetermined level, the controller 140 determines that an error in the cooling fan 181 has occurred.

The predetermined level corresponds to a pulse frequency at the rotation speed of the cooling fan 181 when a predetermined amount of power is supplied. For example, the display apparatus 100 may control the cooling fan 181 to be driven at a specific rotation speed to cool internal heat, and in this case, the level according to the specific rotation speed value may be 7 levels. . If power is not supplied to the cooling fan 181 due to disconnection or the like, the level corresponding to the sensed pulse frequency may have a value lower than the 7 level.

According to an embodiment, when the level according to the sensed pulse frequency is lower than a predetermined level, the controller 140 may determine that an error has occurred in the cooling fan 181 . Also, when the level according to the sensed pulse frequency deviates from a predetermined level, the controller 140 may determine that an error has occurred in the cooling fan 181 . In the latter case, a case in which the rotation speed of the cooling fan 181 is accelerated by the wind generated outside the cooling fan 181 is considered.

The predetermined level may be a plurality of consecutive levels considering that wind generated outdoors is applied to the cooling fan 181 in a forward or reverse direction. For example, when power corresponding to 7 levels is supplied to the cooling fan 181 , and a forward wind is applied to the cooling fan 181 , the control unit 140 may detect a pulse frequency corresponding to the 8 level. . Conversely, when power corresponding to the 7th level is supplied to the cooling fan 181 , and a reverse wind is applied to the cooling fan 181 , the controller 140 may detect a pulse frequency corresponding to the 6th level. The number of a plurality of consecutive levels may vary according to a location where the display apparatus 100 is disposed. For example, when the display apparatus 100 is disposed in a location where the wind is relatively strong, the number of consecutive plurality of levels may be set to be higher than that in a location where the wind is not strong.

The above-described embodiments may be applied not only to a single cooling fan, but also to a plurality of cooling fans 181-1, 181-2, and 181-3. However, when the cooling fan 181 installed in the display apparatus 100 is composed of a plurality of cooling fans 181-1, 181-2, and 181-3, the control unit 140 controls the cooling fan irrespective of a predetermined level. Error occurrence can be determined.

Specifically, the controller 140 may detect each pulse frequency output from the plurality of cooling fans 181-1, 181-2, and 181-3. In this case, the controller 140 may determine that an error has occurred in at least one cooling fan that is different from the level of the remaining cooling fans by providing a level to each pulse frequency and determining whether all the provided levels are the same. For example, when the number of the plurality of cooling fans is four, the levels of the three cooling fans are the same, and the levels of any one cooling fan are different, it may be determined that an error has occurred in one of the cooling fans.

In the above, the configuration of the display apparatus 100 according to an embodiment and the operation by each configuration have been described. Hereinafter, steps performed by each of the display apparatus 100 and the server 200 will be described in detail with reference to FIGS. 6 to 8 .

6 is a control flowchart between a display device and a server according to an exemplary embodiment. However, this is only a preferred embodiment for achieving the object of the present invention, and it goes without saying that some steps may be added or deleted as needed.

The display apparatus 100 detects a pulse frequency caused by the rotation of the cooling fan 181 (601), determines the level of the sensed pulse frequency (602), and detects an error occurrence of the cooling fan 181 based on the level Judgment (603). Specifically, when the level according to the sensed pulse frequency deviates from or is lower than the predetermined level, the display apparatus 100 determines that an error has occurred in the cooling fan 181 . In addition, when there are a plurality of cooling fans 181 , it is possible to determine the occurrence of an error in the cooling fan 181 based on each assigned level.

The display apparatus 100 transmits an error determination result for the cooling fan 181 to the server 200 ( 604 ). The display apparatus 100 may monitor the operating state of the cooling fan 181 in real time and periodically transmit an error determination result to the server 200 . In addition, when the display apparatus 100 includes a plurality of cooling fans 181-1, 181-2, and 181-3, the location information of the cooling fan 181 in which the pulse signal is generated is transmitted to the server through the communication unit 130 . It can be sent to (200). For example, the display apparatus 100 transmits the location information of the cooling fan 181 where the error has occurred to the server 200 so that the user can immediately respond to the cooling fan error.

The server 200 receives the error determination result of the cooling fan 181 (605), and proceeds to respond to the error resolution (606).

In the above, the control flow between the display apparatus 100 and the server 200 has been described. Hereinafter, each independent control process of the display apparatus 100 and the server 200 will be described in detail.

7 is a flowchart of a method for controlling a display apparatus according to an exemplary embodiment. However, this is only a preferred embodiment for achieving the object of the present invention, and it goes without saying that some steps may be added or deleted as needed.

The display apparatus 100 controls the cooling fan 181 to be driven at a rotation speed corresponding to the internal temperature of the display apparatus ( 701 ). For example, when the internal temperature reaches a certain level, the display apparatus 100 controls the rotation speed of the cooling fan 181 to rotate at a constant rotation speed in order to emit internal heat or cool various components. Also, the display apparatus 100 may control the cooling fan 181 so that the cooling fan 181 has a constant rotation speed or a maximum rotation speed according to a user input.

In step 701 , when the cooling fan 181 is driven by the control signal of the display apparatus 100 , a pulse frequency of the cooling fan 181 is detected ( 702 ). At this time, the detected pulse frequency may be changed according to the rotation speed of the cooling fan 181, and the rotation speed of the cooling fan 181 is the amount of power supplied from the power supply unit 170 (refer to FIG. 2) or the cooling fan ( 181), which can be changed depending on at least one of the winds. For example, when there is no wind outside, the rotation speed of the cooling fan 181 may depend only on the amount of power supplied from the display device 100 , there is wind outside, and power supply from the power supply unit 170 . When this is blocked, the rotation speed of the cooling fan 181 may depend only on the physical force caused by the wind. Also, the rotation speed of the cooling fan 181 may depend on both the power supply and the wind.

The cooling fan 181 may be rotated by external wind even when the power supply is cut off or unstable, and at this time, the cooling fan 181 may output a pulse signal different from the control intention of the display 100, When determining whether to operate based only on the voltage (or current) output from the cooling fan 181 , a misdetection may occur.

Accordingly, the display apparatus 100 gives a level to the pulse frequency generated by the rotation of the cooling fan 181 and detects the occurrence of an error in the cooling fan 181 by comparing the level with a level defined for each frequency section. The display apparatus 100 determines to which level the sensed pulse frequency belongs among previously stored levels for each frequency section ( 703 ).

The display apparatus 100 determines whether the detected pulse frequency level belongs to a predetermined level ( 704 ).

In this case, the predetermined level may be any one of a plurality of levels, and when the level of the sensed pulse frequency is not the same as the predetermined level, it may be determined that an error has occurred in the cooling fan 181 . In addition, when the predetermined level is set to a plurality of consecutive levels among the plurality of levels and deviates from a predetermined level section, it may be determined that an error has occurred in the cooling fan 181 .

Also, when the level corresponding to the sensed pulse frequency is higher or lower than a predetermined level, the display apparatus 100 may determine that an error has occurred in the cooling fan 181 .

Also, the display apparatus 100 may detect the occurrence of an error in the cooling fan 181 by detecting a pulse voltage output by the rotation of the cooling fan 181 . Specifically, when the pulse voltage is a predetermined voltage value, the display apparatus 100 may determine that an error has occurred in the cooling fan 181 . For example, when the pulse voltage generated by the cooling fan 181 is a predetermined voltage value, the display apparatus 100 may determine that the cooling fan 181 is not in operation. The predetermined voltage value corresponds to a pulse voltage having a high level or a low level and indicates a case in which there is no change in the pulse voltage. For example, the high level voltage value may be 3.3 V, and the low level voltage value may be 0 V.

As a result of the determination in step 704 , when the level of the pulse frequency belongs to a predetermined level, the display apparatus 100 determines that the cooling fan 181 operates normally (operation 705 ).

Conversely, if the level of the pulse frequency does not belong to the predetermined level, the display apparatus 100 determines that an error has occurred in the cooling fan 181 ( 706 ), and transmits whether an error has occurred to the server 200 .

In addition, the display apparatus 100 may perform a control operation for resolving the error by itself in addition to transmitting the error occurrence to the server 200 . For example, when an error occurs in the cooling fan 181 , the display apparatus 100 lowers the brightness of the backlight unit in consideration of the case where the internal temperature rises to lower the internal temperature without the cooling fan 181 . can

8 is a flowchart of a method for controlling a server according to an exemplary embodiment. However, this is only a preferred embodiment for achieving the object of the present invention, and it goes without saying that some steps may be added or deleted as needed.

The server 200 is connected to the display apparatus 100 through a network to monitor the operating state of a cooling fan driven in the display apparatus 100 . The server 200 can periodically monitor the error occurrence result from the display device 100 unilaterally, and also transmits a control command to the display device 100 to arbitrarily drive the cooling fan 181 to the display device. (100) can be configured to perform error detection in real time.

The server 200 may transmit a signal for controlling the cooling fan 181 of the display apparatus 100 to be arbitrarily driven ( 801 ). For example, the server 200 may transmit a control signal for turning on/off the cooling fan 181 of the display apparatus 100 to the display apparatus 100 . In this case, the display apparatus 100 may detect the occurrence of an error in the cooling fan 181 based on a pulse frequency generated by the cooling fan 181 forcibly driven by the server 200 .

Also, the server 200 may transmit a signal for controlling the cooling fan 181 of the display apparatus 100 to maximize the rotation speed. In this case, the display apparatus 100 may detect the occurrence of an error in the cooling fan 181 based on a pulse frequency generated by the cooling fan 181 driven at the maximum speed by the server 200 . For example, in the display apparatus 100, when the speed of the cooling fan 181 is the maximum speed, the level is 9 (refer to FIG. 5), and when the level by the sensed pulse frequency is lower than the level 9, the cooling fan 181 ) can be considered as an error.

When an error occurs in the cooling fan 181 , the server 200 receives from the display apparatus 100 whether an error has occurred in the cooling fan 181 ( 803 ).

Also, when the cooling fan of the display apparatus 100 includes a plurality of cooling fans, the server 200 may also receive location information of the cooling fan in which an error has occurred ( 804 ).

When the server 200 receives the error detection result of the cooling fan 181 and the location information of the cooling fan 181 in which the error occurs from the display apparatus 100, the server 200 proceeds to respond to the error (805).

Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing instructions executable by a computer. Instructions may be stored in the form of program code, and when executed by a processor, may create a program module to perform the operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

The computer-readable recording medium includes any type of recording medium in which instructions readable by the computer are stored. For example, there may be a read only memory (ROM), a random access memory (RAM), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, and the like.

The disclosed embodiments have been described with reference to the accompanying drawings as described above. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be practiced in other forms than the disclosed embodiments without changing the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

a cooling fan including a motor;

a pulse detection unit detecting a pulse signal output from the motor by rotation of the cooling fan and counting the number of high pulses in the pulse signal; and

Calculate the pulse frequency of the pulse signal based on the number of high pulses, determine which level the pulse frequency belongs to among previously stored levels for each frequency section, and when the level of the pulse frequency deviates from a predetermined level, the A display device comprising a; a control unit that determines that an error of the cooling fan has occurred.
The method of claim 1,

The control unit is

A display apparatus for calculating the pulse frequency based on the number of high pulses counted in a predetermined period of the pulse signal and providing a level corresponding to the pulse frequency.
The method of claim 1,

Further comprising; a temperature sensing unit for sensing the internal temperature of the display device;

The control unit is

A display for controlling the cooling fan to be driven at a rotation speed corresponding to the internal temperature, and determining that an error of the cooling fan has occurred when the level of the sensed pulse frequency is lower than the level of the pulse frequency corresponding to the rotation speed Device.
The method of claim 1,

The pulse sensing unit,

Detecting the pulse voltage output by the rotation of the cooling fan,

The control unit is

A display device that determines that an error has occurred in the cooling fan when the pulse voltage is a predetermined voltage value.
5. The method of claim 4,

The control unit is

If the predetermined voltage value is a pulse voltage having a high level or a low level, the sensed pulse frequency deviates from the predetermined level, or the pulse voltage is a predetermined voltage value, the cooling fan A display device that determines that an error has occurred.
The method of claim 1,

Further comprising; a communication unit for performing communication with an external server;

When an error in the cooling fan occurs, the control unit controls the communication unit to transmit the determination result to the server.
7. The method of claim 6,

The control unit is

A display device that controls the power supply of the display device to turn on/off the cooling fan, and controls the communication unit to transmit the determination result to the server when an error occurs in the cooling fan while the cooling fan is turned on/off .
7. The method of claim 6,

The control unit is

A display device for controlling the power supply unit of the display device so that the rotation speed of the cooling fan is maximized, and controlling the communication unit to transmit the determination result to the server when an error of the cooling fan occurs while the cooling fan is driven .
9. The method of claim 8,

The control unit is

A display device for determining a level corresponding to the sensed pulse frequency while the cooling fan is being driven, and determining that an error has occurred in the cooling fan when the determined level is less than a predetermined level.
7. The method of claim 6,

The control unit is

When the number of the cooling fans is plural, the display device controls the communication unit to transmit location information of the cooling fan in which an error has occurred to the server.
A method of controlling a display device including a cooling fan provided with a motor, the method comprising:

detecting a pulse signal output from the motor by the rotation of the cooling fan, and counting the number of high pulses in the pulse signal; and

Calculate the pulse frequency of the pulse signal based on the number of high pulses, determine which level the pulse frequency belongs to among previously stored levels for each frequency section, and when the level of the pulse frequency deviates from a predetermined level, the A control method for a display device that determines that a cooling fan has failed.
12. The method of claim 11,

Determining that an error in the cooling fan has occurred is,

A control method of a display apparatus for calculating the pulse frequency based on the number of high pulses counted in a predetermined period of the pulse signal and providing a level corresponding to the pulse frequency.
12. The method of claim 11,

Sensing the internal temperature of the display device; further comprising,

Determining that an error in the cooling fan has occurred is,

A display for controlling the cooling fan to be driven at a rotation speed corresponding to the internal temperature, and determining that an error of the cooling fan has occurred when the level of the sensed pulse frequency is lower than the level of the pulse frequency corresponding to the rotation speed How to control the device.
12. The method of claim 11,

Sensing the pulse voltage output by the rotation of the cooling fan; further comprising,

Determining that an error in the cooling fan has occurred is,

When the pulse voltage is a predetermined voltage value, the control method of the display device for determining that an error of the cooling fan has occurred.
15. The method of claim 14,

Determining that an error in the cooling fan has occurred is,

If the predetermined voltage value is a pulse voltage having a high level or a low level, the sensed pulse frequency deviates from the predetermined level, or the pulse voltage is a predetermined voltage value, the cooling fan A control method of a display device that determines that an error has occurred.