A driving circuit board, a backlight module and a display device

Abstract

The application discloses a driving circuit board, a backlight module and a display device, relates to the field of display screen backlight modules, and is used for realizing that a first processor has multiple functions while the packaging volume and cost of the first processor are not increased. The driving circuit board is applied to the backlight module, and the driving circuit board comprises a first processor, a first resistor, a second resistor, a third resistor and a selection circuit. The first resistor is connected between a power supply pin and an input-output pin of the first processor. The fixed end of the selection circuit is connected with the input-output pin. The first selection end of the selection circuit is connected with the first end of the second resistor. The second selection end of the selection circuit is connected with the first end of the third resistor. The second end of the second resistor and the second end of the third resistor are used for being connected with a grounding end. The resistance values of the second resistor and the third resistor are different. The first processor is used for determining the working mode of the first processor according to the voltage of the input-output pin.

Description

Technical Field

[0001] This application relates to the field of display backlight modules, and more particularly to a driver circuit board, a backlight module, and a display device. Background Technology

[0002] In display devices, the backlight module is the core component that enables the screen to emit light. Its function is to provide a uniform light source for the display screen and ensure that the image is displayed normally.

[0003] In the use of backlight modules, there are many situations where it is necessary to add functions to the backlight module to ensure the reliability of the design. Related technologies add more pins (also known as PINs) to the backlight chip in the backlight module to realize the multi-functionality of the backlight module. However, this will lead to a larger backlight chip package, resulting in increased substrate design space and increased costs. Utility Model Content

[0004] This application provides a driver circuit board, a backlight module, and a display device to enable a first processor to have multiple functions without increasing the packaging size and cost of the first processor.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, embodiments of this application provide a driving circuit board applied to a backlight module. The driving circuit board includes: a first processor, a first resistor, a second resistor, a third resistor, and a selection circuit. The first resistor is connected between the power supply pin and the input / output pin of the first processor; the fixed terminal of the selection circuit is connected to the input / output pin; the first selection terminal of the selection circuit is connected to the first terminal of the second resistor; the second selection terminal of the selection circuit is connected to the first terminal of the third resistor; the second terminals of the second and third resistors are used to connect to a ground terminal; the second and third resistors have different resistance values; the first processor is used to determine the operating mode of the first processor based on the voltage of the input / output pin.

[0007] In this embodiment, by connecting a first resistor between the power supply pin and the input / output pin of the first processor, and connecting the fixed terminal of the selection circuit to the input / output pin, connecting the first selection terminal of the selection circuit to the first end of the second resistor, connecting the second selection terminal of the selection circuit to the first end of the third resistor, and connecting the second ends of the second and third resistors to the ground terminal, the first, second, and third resistors form a voltage divider network. When the selection circuit selects the first selection terminal, the first and second resistors divide the voltage; when the selection circuit selects the second selection terminal, the first and third resistors divide the voltage. Since the second and third resistors have different resistance values, the voltages of the input / output pins are different when the selection circuit selects different selection terminals. The first processor can determine its operating mode based on the voltages of the input / output pins, thereby enabling the first processor to have multiple functions without increasing the number of pins, the package size, or the cost.

[0008] In one implementation, when the selection circuit selects the first selection terminal, the first processor operates in a frequency spread spectrum mode. When the selection circuit selects the second selection terminal, the first processor operates in a phase delay mode.

[0009] In one embodiment, the selection circuit includes a single-pole multi-throw switch; the fixed terminal of the single-pole multi-throw switch is the fixed terminal of the selection circuit, the first selection terminal of the single-pole multi-throw switch is the first selection terminal of the selection circuit, and the second selection terminal of the single-pole multi-throw switch is the second selection terminal of the selection circuit.

[0010] In one embodiment, the selection circuit includes a first switch and a second switch. A first terminal of the first switch is a fixed terminal of the selection circuit, and a second terminal of the first switch is a first selection terminal of the selection circuit; a first terminal of the second switch is a fixed terminal of the selection circuit, and a second terminal of the second switch is a second selection terminal of the selection circuit.

[0011] In one embodiment, the driver circuit board further includes a fourth resistor and a second processor. The first end of the fourth resistor is connected to the third selection terminal of a single-pole multi-throw switch, which is the third selection terminal of the selection circuit. The second end of the fourth resistor is connected to a ground terminal. The resistance value of the fourth resistor is different from the resistance values ​​of the second and third resistors. The input terminal of the second processor is connected to input / output pins. After the first processor determines the operating mode, if the selection circuit selects the third selection terminal of the selection circuit, the first processor outputs an alarm signal to the second processor through the input / output pins. The alarm signal indicates whether an abnormality has occurred in the backlight module.

[0012] In one embodiment, the driver circuit board further includes a third switch, a fourth resistor, and a second processor. The first terminal of the third switch is a fixed terminal of the selection circuit, and the second terminal of the third switch is a third selection terminal of the selection circuit. The first terminal of the fourth resistor is connected to the second terminal of the third switch, and the second terminal of the fourth resistor is used to connect to a ground terminal. The resistance value of the fourth resistor is different from both the resistance values ​​of the second and third resistors. The input terminal of the second processor is connected to input / output pins. After the first processor determines the operating mode, if the selection circuit selects the third selection terminal of the selection circuit, the first processor outputs an alarm signal to the second processor through the input / output pins. The alarm signal is used to indicate whether an abnormality has occurred in the backlight module.

[0013] In one implementation, the first processor is used to determine the operating mode of the first processor based on the voltage of the input / output pins after the backlight module is powered on and a time threshold has elapsed.

[0014] Secondly, embodiments of this application provide a backlight module, which includes a driver circuit board and an LED light source array. The LED light source array is connected to the driver circuit board, and the driver circuit board is the driver circuit board described in the first aspect or any embodiment of the first aspect.

[0015] Thirdly, embodiments of this application provide a display device, which includes a backlight module and a display screen. The display screen is connected to the backlight module, and the backlight module is the backlight module described in the second aspect or any embodiment of the second aspect. The backlight module is used to provide a uniform light source for the display screen. Attached Figure Description

[0016] Figure 1 A schematic diagram of the circuit topology of a driver circuit board provided in an embodiment of this application;

[0017] Figure 2 A schematic diagram of another driving circuit board provided in an embodiment of this application;

[0018] Figure 3 A schematic diagram of another driving circuit board provided in an embodiment of this application;

[0019] Figure 4 A schematic diagram of another driving circuit board provided in an embodiment of this application;

[0020] Figure 5 A schematic diagram of another driving circuit board provided in an embodiment of this application;

[0021] Figure 6 A circuit topology diagram of a backlight module provided in an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of the circuit topology of a display device provided in an embodiment of this application.

[0023] Figure label:

[0024] 1. Display device

[0025] 10. Backlight module; 20. Display screen;

[0026] 100. Driver circuit board; 200. LED light source array;

[0027] 110. First processor; 120. Selection circuit; 130. Power supply chip; 140. Second processor;

[0028] IO, Input / Output pins; VCC, Power supply pin; GND, Ground pin;

[0029] S, Single-pole multi-throw switch; K1, First switch; K2, Second switch; K3, Third switch;

[0030] R1 is the first resistor; R2 is the second resistor; R3 is the third resistor. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Hereinafter, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature.

[0033] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0034] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0035] In display devices, the backlight module is the core component that enables the screen to emit light. Its function is to provide a uniform light source for the display screen and ensure that the image is displayed normally.

[0036] In the use of backlight modules, there are many situations where it is necessary to add functions to the backlight module to ensure the reliability of the design. Related technologies add more pins (also known as PINs) to the backlight chip in the backlight module to realize the multi-functionality of the backlight module. However, this will lead to a larger backlight chip package, resulting in increased substrate design space and increased costs.

[0037] To address the aforementioned technical problems, embodiments of this application provide a driver circuit board, a backlight module, and a display device. The driver circuit board provided in the embodiments of this application is described below.

[0038] like Figure 1 The diagram shown is a schematic diagram of the circuit topology of a driver circuit board 100 provided in an embodiment of this application. The driver circuit board 100 is applied to a backlight module 10 and includes: a first processor 110, a first resistor R1, a second resistor R2, a third resistor R3, and a selection circuit 120.

[0039] The first resistor R1 is connected between the power supply pin VCC and the input / output pin IO of the first processor 110. The fixed terminal of the selection circuit 120 is connected to the input / output pin IO. The first selection terminal of the selection circuit 120 is connected to the first end of the second resistor R2, and the second selection terminal of the selection circuit 120 is connected to the first end of the third resistor R3. The second ends of the second resistor R2 and the second ends of the third resistor R3 are used to connect to the ground terminal GND. The resistance values ​​of the second resistor R2 and the third resistor R3 are different. The first processor 110 is used to determine the operating mode of the first processor 110 based on the voltage of the input / output pin IO.

[0040] In one embodiment, the first processor 110 can be a microcontroller, the circuit composed of the microcontroller and the first resistor R1 can be called a backlight chip, and the input / output pins (IO) of the first processor 110 can be called the input / output pins of the backlight chip.

[0041] In one implementation, when the selection circuit 120 selects the first selection terminal, the first processor 110 operates in frequency spread spectrum (FS) mode; when the selection circuit 120 selects the second selection terminal, the first processor 110 operates in phase delay mode (DF).

[0042] The operating frequency spread spectrum mode is used in EMC and RE / CE tests when certain frequencies exceed specifications. Spread spectrum can reduce the energy at these frequencies to pass the test. The phase delay mode introduces a phase difference between the outputs of several LEDs. Without this function, simultaneous switching of several LEDs may cause an energy surge when they are turned on at the same time, affecting LED lifespan. Enabling the phase delay mode solves this problem. It also prevents a brief black screen that may occur when several LEDs are turned off simultaneously.

[0043] In one implementation, the selection circuit 120 is not limited to having two selection terminals; it can have multiple selection terminals. These multiple selection terminals are connected to resistors of different values, ensuring that the voltage VIO at the input / output pin IO is different when different selection terminals are activated. This allows for the selection of different modes based on the varying VIO values. For example, with four selection terminals, four operating modes can be selected based on the voltage at the input / output pin IO.

[0044] In one implementation, reference is made to Figure 1 The driver circuit board 100 also includes a power chip 130, with the power pin VCC connected to the power chip 130. The power chip 130 is used to provide a power supply voltage, such as 3.3V, to the first processor 110.

[0045] Let the voltage of the input / output pin IO be VIO, and the voltage provided by the power supply chip 130 be VIN. Then, when the selection circuit 120 selects the first selection terminal, When the second selection terminal is selected by the selection circuit 120,

[0046] For example, the first resistor R1 has a resistance of 10kΩ, the second resistor R2 has a resistance of 10kΩ, and the third resistor R3 has a resistance of 20kΩ, which is different from the second resistor R2. When the first selection terminal is selected by the selection circuit 120, When VIO is 1.65V, the first processor 110 operates in FS mode. When the selection circuit 120 selects the second selection terminal, When VIO is 1.1V, the first processor 110 operates in DF mode.

[0047] In one embodiment, the first processor 110 is used to determine the operating mode of the first processor 110 based on the voltage of the input / output pin IO after the backlight module 10 is powered on and a time threshold has elapsed.

[0048] The first processor 110 determines its operating mode based on the voltage of the input / output pins (IO) only after the backlight module 10 is powered on and a time threshold has elapsed. This is to ensure that the voltage of the input / output pins (IO) stabilizes before determining the operating mode, which makes the determination of the operating mode of the first processor 110 more accurate.

[0049] In one implementation, the time threshold can be 20ms.

[0050] In this embodiment, a first resistor R1 is connected between the power supply pin VCC and the input / output pin IO of the first processor 110, and the fixed terminal of the selection circuit 120 is connected to the input / output pin IO. The first selection terminal of the selection circuit 120 is connected to the first end of the second resistor R2, and the second selection terminal of the selection circuit 120 is connected to the first end of the third resistor R3. The second ends of the second resistor R2 and the second ends of the third resistor R3 are connected to the ground terminal GND, so that the first resistor R1, the second resistor R2, and the third resistor R3 form a voltage divider network. When the selection circuit 120 selects the first selection terminal, the first resistor R1 and the second resistor R2 divide the voltage; when the selection circuit 120 selects the second selection terminal, the first resistor R1 and the third resistor R3 divide the voltage. Since the resistance values ​​of the second resistor R2 and the third resistor R3 are different, the voltage of the input / output pin IO is also different when the selection circuit 120 selects different selection terminals. The first processor 110 can determine its operating mode based on the voltage of its input / output pins (IO), thereby enabling the first processor 110 to have multiple functions without adding pins or increasing its package size and cost.

[0051] In one implementation, such as Figure 2 The diagram shows a circuit topology of another driving circuit board 100 provided in an embodiment of this application. The selection circuit 120 can be a single-pole multi-throw switch S. The fixed terminal of the single-pole multi-throw switch S is the fixed terminal of the selection circuit 120, the first selection terminal of the single-pole multi-throw switch S is the first selection terminal of the selection circuit 120, and the second selection terminal of the single-pole multi-throw switch S is the second selection terminal of the selection circuit 120.

[0052] In one implementation, such as Figure 3The diagram shows a circuit topology of another driving circuit board provided in an embodiment of this application. The selection circuit 120 includes a first switch K1 and a second switch K2. The first end of the first switch K1 is the fixed end of the selection circuit 120, and the second end of the first switch K1 is the first selection end of the selection circuit 120. The first end of the second switch K2 is the fixed end of the selection circuit 120, and the second end of the second switch K2 is the second selection end of the selection circuit 120.

[0053] In one implementation, such as Figure 4 The diagram shows another circuit topology of a driver circuit board provided in an embodiment of this application. The driver circuit board 100 also includes a fourth resistor R4 and a second processor 140.

[0054] The first end of the fourth resistor R4 is connected to the third selection terminal of the single-pole multi-throw switch S, which is the third selection terminal of the selection circuit 120. The second end of the fourth resistor R4 is used to connect to the ground terminal GND. The resistance value of the fourth resistor R4 is different from the resistance values ​​of the second resistor R2 and the third resistor R3. The input terminal of the second processor 140 is connected to the input / output pin IO.

[0055] After the first processor 110 determines the working mode, and the selection circuit 120 selects the third selection terminal of the selection circuit 120, the first processor 110 is used to output an alarm signal to the second processor 140 through the input / output pin IO. The alarm signal is used to indicate whether the backlight module 10 has malfunctioned.

[0056] For example, the power chip 130 provides a voltage of 3.3V. The resistance value of the fourth resistor R4 is different from that of the second resistor R2 and the third resistor R3: R1 = 10kΩ, R2 = 10kΩ, R3 = 20kΩ, and R4 = 30kΩ. After the operating mode of the first processor 110 is determined, the selection circuit 120 selects the third selection terminal. The first resistor R1 and the fourth resistor R4 divide the voltage VIN provided by the power chip 130. At this time, the voltage of the input / output pins... When VIO is 0.825V, the first processor 110 outputs an alarm signal to the second processor 140.

[0057] In one implementation, the alarm signal is a fault interrupt (INT) signal. When the backlight chip detects an abnormality in the backlight module 10, it outputs an INT signal through its input / output (I / O) pins for the second processor 140 to recognize. The second processor 140 is a host computer and can be a microcontroller unit (MCU), also known as a single-chip microcomputer. The second processor 140 implements an exception handling strategy based on the INT signal. The INT signal is high under normal conditions and low under abnormal conditions.

[0058] In one implementation, such as Figure 5 The diagram shown is a schematic diagram of another driving circuit board provided in an embodiment of this application. Figure 5 As shown, the drive circuit board 100 also includes: a third switch K3, a fourth resistor R4, and a second processor 140.

[0059] The first end of the third switch K3 is the fixed end of the selection circuit 120, and the second end of the third switch K3 is the third selection end of the selection circuit 120; the first end of the fourth resistor R4 is connected to the second end of the third switch K3, and the second end of the fourth resistor R4 is used to connect to the ground terminal GND. The resistance value of the fourth resistor R4 is different from the resistance values ​​of the second resistor R2 and the third resistor R3; the input terminal of the second processor 140 is connected to the input / output pin IO.

[0060] After the first processor 110 determines the working mode, and the selection circuit 120 selects the third selection terminal of the selection circuit 120, the first processor 110 is used to output an alarm signal to the second processor 140 through the input / output pin IO. The alarm signal is used to indicate whether the backlight module 10 has malfunctioned.

[0061] like Figure 6 The diagram shows a circuit topology of a backlight module 10 according to an embodiment of this application. The backlight module 10 includes a driver circuit board 100 and an LED light source array 200, with the driver circuit board 100 connected to the LED light source array 200. The driver circuit board 100 supplies power to the LED light source array 200 to emit light. The circuit topology of the driver circuit board 100 is as described above. Figures 1 to 5 The circuit topology of the drive circuit board 100 shown in any of the attached figures.

[0062] like Figure 7The diagram shows a circuit topology of a display device 1 according to an embodiment of this application. The display device 1 includes a backlight module 10 and a display screen 20. The display screen 20 is connected to the backlight module 10, and the backlight module 10 provides a uniform light source for the display screen 20. The circuit topology of the backlight module 10 is as described above. Figure 6 The circuit topology of the backlight module 10 shown is illustrated.

[0063] The above detailed description of the driving circuit board 100 and the analysis of its beneficial effects can be applied to the backlight module 10 and the display device 1, and will not be repeated here in the embodiments of this application.

[0064] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A driving circuit board, characterized in that, The driving circuit board is used in the backlight module, and the driving circuit board includes: First processor; The first resistor is connected between the power pin and the input / output pin of the first processor. The system comprises a second resistor, a third resistor, and a selection circuit. The fixed terminal of the selection circuit is connected to the input / output pin. The first selection terminal of the selection circuit is connected to the first terminal of the second resistor. The second selection terminal of the selection circuit is connected to the first terminal of the third resistor. The second terminals of the second and third resistors are used to connect to the ground terminal. The second resistor has a different resistance value than the third resistor; The first processor is configured to determine its operating mode based on the voltage of the input / output pins.

2. The driving circuit board according to claim 1, characterized in that, When the selection circuit selects the first selection terminal, the first processor operates in the operating frequency spread spectrum mode; When the selection circuit selects the second selection terminal, the first processor operates in phase delay mode.

3. The driving circuit board according to claim 1, characterized in that, The selection circuit includes a single-pole multi-throw switch; The fixed terminal of the single-pole multi-throw switch is the fixed terminal of the selection circuit, the first selection terminal of the single-pole multi-throw switch is the first selection terminal of the selection circuit, and the second selection terminal of the single-pole multi-throw switch is the second selection terminal of the selection circuit.

4. The driving circuit board according to claim 1, characterized in that, The selection circuit includes: A first switch, wherein the first end of the first switch is the fixed end of the selection circuit, and the second end of the first switch is the first selection end of the selection circuit; The second switch has a first end that is the fixed end of the selection circuit and a second end that is the second selection end of the selection circuit.

5. The driving circuit board according to claim 3, characterized in that, The driver circuit board also includes: The fourth resistor has its first end connected to the third selection terminal of the single-pole multi-throw switch, which is the third selection terminal of the selection circuit. The second end of the fourth resistor is used to connect to the ground terminal. The resistance value of the fourth resistor is different from the resistance values ​​of the second resistor and the third resistor. The second processor has its input terminal connected to the input / output pins; After the first processor determines the operating mode, if the selection circuit selects the third selection terminal of the selection circuit, the first processor is used to output an alarm signal to the second processor through the input / output pin. The alarm signal is used to indicate whether the backlight module has malfunctioned.

6. The driving circuit board according to claim 4, characterized in that, The driver circuit board also includes: The third switch, wherein the first end of the third switch is the fixed end of the selection circuit, and the second end of the third switch is the third selection end of the selection circuit; A fourth resistor, the first end of which is connected to the second end of the third switch, the second end of which is used to connect to the ground terminal, and the resistance value of the fourth resistor is different from the resistance values ​​of the second resistor and the third resistor. The second processor has its input terminal connected to the input / output pins; After the first processor determines the operating mode, if the selection circuit selects the third selection terminal of the selection circuit, the first processor is used to output an alarm signal to the second processor through the input / output pin. The alarm signal is used to indicate whether the backlight module has malfunctioned.

7. The driving circuit board according to claim 1, characterized in that, The first processor is configured to determine the operating mode of the first processor based on the voltage of the input / output pins after the backlight module is powered on and a time threshold has elapsed.

8. A backlight module, characterized in that, include: The drive circuit board as described in any one of claims 1 to 7; An LED light source array, wherein the LED light source array is connected to the driving circuit board.

9. A display device, characterized in that, include: The backlight module as described in claim 8; The display screen is connected to the backlight module, which provides a uniform light source for the display screen.

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