Backlight source protection circuit

Abstract

The utility model is suitable for the technical field of displays, and provides a backlight protection circuit. The backlight source protection circuit comprises a plurality of temperature sensors and a plurality of temperature measuring units. Each temperature measuring unit is electrically connected with at least one temperature measuring sensor; the temperature sensor comprises two temperature signal output ends, and the temperature measuring unit receives temperature signal input of the temperature sensor through a first temperature signal input end and a second temperature signal input end; the temperature sensors are used for being arranged on a backlight assembly of a display panel in an array arrangement mode to form a temperature detection array for the backlight assembly. And the different temperature measuring units are mutually connected through the temperature control bus. According to the invention, the temperature state of the display panel of the display is known in real time through the plurality of temperature sensors arranged on the display module, and the low temperature and high temperature states can be detected through the comparator, so that the corresponding temperature control module is controlled to work, and the protection of equipment is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of displays, and in particular relates to a backlight source protection circuit. Background Art

[0002] Outdoor display is a high-brightness, durable display device widely used in outdoor places. It can display clear and vivid images and video content in various harsh climate conditions by using advanced LED technology and protection measures. The core component of outdoor display is LED (Light Emitting Diode) module. LED module is composed of hundreds or even thousands of light-emitting diodes, and each LED pixel can independently adjust the brightness and color. This modular design allows outdoor display to be flexibly configured in size and pixel density as needed.

[0003] Outdoor display screens usually need to withstand various harsh climatic conditions, especially temperature factors, which can significantly affect the life and working state of the display. For example, high temperature can significantly reduce the life of the LED components in the display, while in low temperature environments, the control circuit may not work properly and the structure of the display backlight may be damaged. Existing displays often use public mold designs, which makes it difficult to effectively maintain their normal use in harsh temperature environments. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a backlight protection circuit, aiming to solve the problem that existing displays often adopt a common mold design and it is difficult to effectively maintain their normal use in harsh temperature environments.

[0005] The embodiment of the present application is implemented by providing a backlight protection circuit, the backlight protection circuit comprising:

[0006] A number of temperature sensors and a number of temperature measuring units;

[0007] Each temperature measuring unit is electrically connected to at least one temperature measuring sensor; the temperature sensor comprises two temperature signal output terminals, and the temperature measuring unit receives the temperature signal input of the temperature sensor through the first temperature signal input terminal and the second temperature signal input terminal;

[0008] The temperature sensors are used to be arranged in an array on the backlight assembly of the display panel to form a temperature detection array for the backlight assembly;

[0009] The first temperature signal input terminal is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the power supply VCC, the power supply VCC is respectively connected to the first end of the resistor R5, the first end of the resistor R6, and the first end of the resistor R7, the second end of the resistor R5 is connected to the reverse end of the second comparator, the same direction end of the second comparator is connected to the first end of the resistor R3, the second end of the resistor R3 is grounded, the second end of the resistor R6 is connected to the reverse end of the first comparator, the positive end of the first comparator is connected to the second temperature signal input terminal, the second temperature signal input terminal is also connected to the first end of the resistor R1, the second end of the resistor R1 is grounded, the output end of the first comparator, the output end of the second comparator and the second end of the resistor R7 are connected to each other, and the output end of the first comparator is also connected to the temperature control bus;

[0010] The different temperature measuring units are connected to each other via the temperature control bus.

[0011] Preferably, the backlight protection circuit further includes:

[0012] A temperature control unit is interconnected with the temperature measuring unit through the temperature control bus, and is used to perform temperature control based on the temperature abnormality signal output from the temperature measuring unit.

[0013] Preferably, the temperature control unit is provided with a plurality of temperature control input terminals, and each of the temperature control input terminals corresponds to receiving a temperature signal transmitted from the temperature measuring unit.

[0014] Preferably, the backlight protection circuit further includes:

[0015] Heating controller and cooling controller;

[0016] The heating controller is connected to the temperature control unit, and a heating relay is arranged therein, and the heating relay is used to control the start and stop of the heater;

[0017] The heat dissipation controller is connected to the temperature control unit, and a heat dissipation relay is arranged therein, and the heat dissipation relay is used to control the start and stop of the radiator.

[0018] Preferably, it is characterized in that each of the temperature measuring units is electrically connected to 2 to 4 temperature measuring sensors.

[0019] Preferably, the backlight protection circuit further includes a power supply unit;

[0020] The power supply unit is connected to the city power grid, and comprises a transformer module and a rectifier module, and is used to supply power to the temperature measuring unit and the temperature control unit.

[0021] Preferably, the power supply circuit is also used to supply power to the radiator and the heater.

[0022] A backlight protection circuit provided in an embodiment of the present application has the advantages of being able to utilize a number of temperature sensors arranged on a display module to obtain the temperature state of a display panel of the display in real time, and through two comparators, being able to detect low and high temperature states respectively, and then inputting a temperature control signal into a temperature control chip through a bus, so that the chip controls the relevant temperature control unit and controls the operation of the corresponding temperature control module, thereby realizing the detection, adjustment and protection of the operating temperature of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A circuit diagram of a temperature measurement module of a backlight protection circuit provided in an embodiment of the present application;

[0024] Figure 2 A module diagram of a backlight protection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] As used herein, "coupled" or "connected" may refer to two or more elements making direct physical or electrical contact with each other, or making indirect physical or electrical contact with each other, or may refer to two or more elements operating or acting on each other. The term "circuit" generally refers to an object composed of one or more transistors and / or one or more active and passive components connected in a certain manner to process signals.

[0027] However, those skilled in the art will appreciate that the same element may be referred to by different names. This application does not distinguish elements by name, but by functional differences.

[0028] In addition, the embodiments of the present application include features of multiple specific embodiments and method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments may also be used to achieve the same or equivalent functions and step sequences. Unless otherwise defined in this specification, the meanings of scientific and technical terms used herein are the same as those understood and used by technicians in the field to which this application belongs. In addition, singular nouns used in this specification include plural forms of the nouns, and plural nouns used also include singular forms of the nouns, unless otherwise conflicting with the context.

[0029] The specific implementation of the present application is described in detail below in conjunction with specific embodiments.

[0030] In one embodiment, Figure 2As shown, a structural diagram of the overall backlight source protection circuit is provided, which includes several temperature measurement units and related temperature control components connected thereto.

[0031] In one embodiment, if Figure 1 As shown, it is a circuit diagram of a temperature measuring unit in a backlight source protection circuit provided in an embodiment of the present application.

[0032] In one embodiment, a backlight protection circuit is provided, and the backlight protection circuit includes:

[0033] A number of temperature sensors and a number of temperature measuring units;

[0034] Each temperature measuring unit is electrically connected to at least one temperature measuring sensor; the temperature sensor comprises two temperature signal output terminals, and the temperature measuring unit receives the temperature signal input of the temperature sensor through the first temperature signal input terminal and the second temperature signal input terminal;

[0035] The temperature sensors are used to be arranged in an array on the backlight assembly of the display panel to form a temperature detection array for the backlight assembly;

[0036] The first temperature signal input terminal is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the power supply VCC, the power supply VCC is respectively connected to the first end of the resistor R5, the first end of the resistor R6, and the first end of the resistor R7, the second end of the resistor R5 is connected to the reverse end of the second comparator, the same direction end of the second comparator is connected to the first end of the resistor R3, the second end of the resistor R3 is grounded, the second end of the resistor R6 is connected to the reverse end of the first comparator, the positive end of the first comparator is connected to the second temperature signal input terminal, the second temperature signal input terminal is also connected to the first end of the resistor R1, the second end of the resistor R1 is grounded, the output end of the first comparator, the output end of the second comparator and the second end of the resistor R7 are connected to each other, and the output end of the first comparator is also connected to the temperature control bus;

[0037] The different temperature measuring units are connected to each other via the temperature control bus.

[0038] In an embodiment of the present application, the circuit includes a temperature sensor, which may be a thermistor, a thermocouple, a thermal sensitive device, etc. These temperature sensors, such as thermistors, may be connected in series or in parallel, and may be arranged in different parts of the display backlight panel to reflect the temperature of different parts. The circuit also includes a comparator and multiple voltage divider resistors. Changes in ambient temperature will affect changes in the resistance of the thermistor. The circuit also sets a preset standard voltage based on a preset temperature, and obtains a temperature change feedback result by comparing the voltage change at both ends of the temperature sensor with the preset standard voltage.

[0039] In one embodiment, for example, when the temperature is higher than a preset warning value, one of the comparators outputs a low temperature abnormal temperature detection signal. At the same time, if the temperature is lower than the preset warning value, another comparator inputs a high temperature detection signal. These signals can be input to the control terminal through the bus.

[0040] In the embodiment of the present application, several temperature sensors arranged on the display module can be used to obtain the temperature state of the display panel of the display in real time, and through two comparators, the low temperature and high temperature states can be detected respectively, and then the temperature control signal is input into the temperature control chip through the bus, so that the chip controls the relevant temperature control unit and controls the operation of the corresponding temperature control module, thereby realizing the detection, adjustment and protection of the operating temperature of the equipment.

[0041] As a preferred embodiment of the present application, the backlight protection circuit further includes:

[0042] A temperature control unit is interconnected with the temperature measuring unit through the temperature control bus, and is used to perform temperature control based on the temperature abnormality signal output from the temperature measuring unit.

[0043] In the embodiment of the present application, the temperature control unit can collect and summarize the temperature detection data of the temperature measuring unit. The temperature control unit can be provided with a logic control unit. For example, when more than two temperature measuring units detect temperature abnormality signals, the temperature adjustment action is performed to control the corresponding temperature adjustment device to work, so as to avoid misjudgment by a single sensor.

[0044] As another preferred embodiment of the present application, the temperature control unit is provided with a plurality of temperature control input terminals, and each of the temperature control input terminals corresponds to receiving a temperature signal transmitted from the temperature measuring unit.

[0045] In the embodiment of the present application, each signal input and output probe can simultaneously receive one or more signals, preferably, input a temperature measurement signal to accurately know the area where the temperature abnormality occurs.

[0046] As another preferred embodiment of the present application, the backlight protection circuit further includes:

[0047] Heating controller and cooling controller;

[0048] The heating controller is connected to the temperature control unit, and a heating relay is arranged therein, and the heating relay is used to control the start and stop of the heater;

[0049] The heat dissipation controller is connected to the temperature control unit, and a heat dissipation relay is arranged therein, and the heat dissipation relay is used to control the start and stop of the radiator.

[0050] In the embodiment of the present application, the display may contain heating devices such as heating tubes and heating wires, and may also contain cooling devices such as cooling fans. To save energy, these devices do not have to work continuously, and can be started only when the temperature exceeds a preset warning value. Since these devices require higher current and voltage inputs, relays are used to control them separately.

[0051] As another preferred embodiment of the present application, each of the temperature measuring units is electrically connected to 2 to 4 of the temperature measuring sensors.

[0052] In the embodiment of the present application, the temperature sensor can be a thermal resistor or other temperature sensitive element, which can be connected in parallel, in series or in other ways, and the input signal is uniformly input into one temperature sensor. For example, a large LED display screen is composed of a large number of LED sub-display panels, and 2 to 4 sensors can be arranged at different positions on the back of each sub-display panel, and a corresponding temperature measurement unit is set, and these temperature measurement units are connected to each other through a bus.

[0053] As another preferred embodiment of the present application, the backlight protection circuit further includes a power supply unit;

[0054] The power supply unit is connected to the city power grid, and comprises a transformer module and a rectifier module, and is used to supply power to the temperature measuring unit and the temperature control unit.

[0055] In an embodiment of the present application, the temperature control module may use an independent power supply device to power the module, thereby avoiding interference with the power supply of the display module of the display and improving reliability.

[0056] As another preferred embodiment of the present application, the power supply circuit is also used to supply power to the radiator and the heater.

[0057] In the embodiment of the present application, the power supply circuit can also be used to directly power the radiator and the heater, so as to integrate them into a relatively independent temperature control system without relying on other external power supplies, thereby reducing supporting costs.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A backlight protection circuit, characterized in that: The backlight protection circuit comprises: A number of temperature sensors and a number of temperature measuring units; Each temperature measuring unit is electrically connected to at least one temperature measuring sensor; the temperature sensor comprises two temperature signal output terminals, and the temperature measuring unit receives the temperature signal input of the temperature sensor through the first temperature signal input terminal and the second temperature signal input terminal; The temperature sensors are used to be arranged in an array on the backlight assembly of the display panel to form a temperature detection array for the backlight assembly; The first temperature signal input terminal is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the power supply VCC, the power supply VCC is respectively connected to the first end of the resistor R5, the first end of the resistor R6, and the first end of the resistor R7, the second end of the resistor R5 is connected to the reverse end of the second comparator, the same direction end of the second comparator is connected to the first end of the resistor R3, the second end of the resistor R3 is grounded, the second end of the resistor R6 is connected to the reverse end of the first comparator, the positive end of the first comparator is connected to the second temperature signal input terminal, the second temperature signal input terminal is also connected to the first end of the resistor R1, the second end of the resistor R1 is grounded, the output end of the first comparator, the output end of the second comparator and the second end of the resistor R7 are connected to each other, and the output end of the first comparator is also connected to the temperature control bus; The different temperature measuring units are connected to each other via the temperature control bus.

2. The backlight protection circuit according to claim 1, characterized in that: The backlight protection circuit also includes: A temperature control unit is interconnected with the temperature measuring unit through the temperature control bus, and is used to perform temperature control based on the temperature abnormality signal output from the temperature measuring unit.

3. The backlight protection circuit according to claim 2, characterized in that: The temperature control unit is provided with a plurality of temperature control input terminals, and each of the temperature control input terminals corresponds to receiving a temperature signal transmitted from the temperature measuring unit.

4. The backlight protection circuit according to claim 2, characterized in that: The backlight protection circuit also includes: Heating controller and cooling controller; The heating controller is connected to the temperature control unit, and a heating relay is arranged therein, and the heating relay is used to control the start and stop of the heater; The heat dissipation controller is connected to the temperature control unit, and a heat dissipation relay is arranged therein, and the heat dissipation relay is used to control the start and stop of the radiator.

5. The backlight protection circuit according to claim 1, characterized in that: Each of the temperature measuring units is electrically connected to 2 to 4 of the temperature measuring sensors.

6. The backlight protection circuit according to claim 4, characterized in that: The backlight protection circuit also includes a power supply unit; The power supply unit is connected to the city power grid, and comprises a transformer module and a rectifier module, and is used to supply power to the temperature measuring unit and the temperature control unit.

7. The backlight protection circuit according to claim 6, characterized in that: The power supply unit is also used to supply power to the radiator and the heater.

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