Display device

Abstract

The display device provided in an embodiment of the present application includes: a backlight assembly, a power supply module, and a control module. The power supply module is connected to the backlight assembly and is configured to receive a power supply input signal and, based on the power supply input signal and driven by a drive signal, generate a current signal for controlling the brightness of the backlight assembly. The control module is connected to the power supply module and is configured to provide a drive signal and, upon receiving a dimming signal, adjust the frequency of the drive signal based on the dimming signal. The embodiment of the present application can prevent screen flickering in the display device, thereby improving the viewing experience for users.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device. Background Art

[0002] Display devices are devices that display images for users to view and are widely used in various scenarios. Examples include mobile phones, computers, and televisions equipped with display screens. Display devices typically include a power supply unit to provide power. To ensure that users can view images on the display device properly under varying lighting conditions, the display device must adjust its brightness accordingly.

[0003] In related technologies, the current signal in the power supply circuit is typically adjusted by varying the duty cycle of the drive signal from the power supply unit to adjust the power of the display device, thereby adjusting the brightness of the display device. However, when the brightness of the display device is adjusted too low, screen flickering often occurs, thereby reducing the viewing experience for the user. Summary of the Invention

[0004] The present application provides a display device, which aims to solve the problem of screen flickering occurring when the brightness of the display device is adjusted too low.

[0005] The display device provided in the present application includes: a backlight assembly, which is used to provide backlight to the display device; a power supply module, which is connected to the backlight assembly and is used to receive a power supply input signal, and based on the power supply input signal and driven by a driving signal, generates a current signal for controlling the brightness of the backlight assembly; a control module, which is connected to the power supply module and is used to provide the driving signal; and when a dimming signal is received, adjusts the frequency of the driving signal according to the dimming signal.

[0006] Optionally, the control module includes: a processing unit and an external resistance unit with adjustable resistance; the external resistance unit is used to adjust the resistance of the external resistance unit according to the dimming signal; the RT pin of the processing unit is connected to one end of the external resistance unit, and the other end of the external resistance unit is grounded, and the processing unit is used to generate a driving signal of a corresponding frequency based on the current resistance of the external resistance unit.

[0007] Optionally, the external resistance unit includes a signal conversion unit and a variable resistance unit; the input end of the signal conversion unit receives the dimming signal, the output end of the signal conversion unit is connected to the variable resistance unit, the signal conversion unit is used to receive the dimming signal and convert the dimming signal into a DC level signal; the variable resistance unit is used to adjust its own resistance based on the DC level signal.

[0008] Optionally, the signal conversion unit includes a first resistor, a second resistor, a third resistor, a first switching element and a first capacitor, one end of the first resistor receives a first reference voltage, and the other end of the first resistor is connected to one end of the second resistor; the other end of the second resistor is grounded; one end of the third resistor is connected to the other end of the first resistor, and the other end of the third resistor is connected to the first end of the first switching element; the second end of the first switching element is connected to the other end of the second resistor, and the control end of the first switching element receives the dimming signal; one end of the first capacitor is connected to one end of the third resistor, and the other end of the first capacitor is connected to the second end of the first switching element; the other end of the first resistor serves as the output end of the signal conversion unit and is connected to the variable resistance unit.

[0009] Optionally, the signal conversion unit also includes: a fourth resistor and a fifth resistor, one end of the fourth resistor receives the dimming signal, and the other end of the fourth resistor is connected to the control end of the first switching element; one end of the fifth resistor is connected to the control end of the first switching element, and the other end of the fifth resistor is connected to the second end of the first switching element.

[0010] Optionally, the variable resistance unit includes: a first three-terminal regulator and an optocoupler; the reference electrode of the first three-terminal regulator receives the DC level signal; the negative electrode of the first three-terminal regulator is connected to the primary output terminal of the optocoupler, and the positive electrode of the first three-terminal regulator is grounded; the primary input terminal of the optocoupler receives a second reference voltage, the secondary input terminal of the optocoupler is connected to the RT pin of the processing unit, and the secondary output terminal of the optocoupler is grounded.

[0011] Optionally, the variable resistor unit also includes: a sixth resistor and a seventh resistor; one end of the sixth resistor is connected to the RT pin of the processing unit, the other end of the sixth resistor is connected to the secondary input end of the optocoupler element, one end of the seventh resistor is connected to the RT pin of the processing unit, and the other end of the seventh resistor is grounded.

[0012] Optionally, the variable resistance unit also includes: a first voltage divider resistor and a second voltage divider resistor; one end of the first voltage divider resistor receives the DC level signal, and the other end of the first voltage divider resistor is connected to the reference pole of the first three-terminal regulator; one end of the second voltage divider resistor is connected to the other end of the first voltage divider resistor, and the other end of the second voltage divider resistor is connected to the negative pole of the first three-terminal regulator.

[0013] Optionally, the variable resistance unit further includes: an eighth resistor, one end of the eighth resistor is connected to the primary input end of the optocoupler element, and the other end of the eighth resistor is connected to the primary output end of the optocoupler element.

[0014] Optionally, the variable resistance unit also includes: a second capacitor and a ninth resistor and a tenth resistor; one end of the second capacitor is connected to the other end of the first voltage-dividing resistor, and the other end of the second capacitor is connected to one end of the ninth resistor; the other end of the ninth resistor is connected to the primary output end of the optocoupler element; one end of the tenth resistor is connected to one end of the first voltage-dividing resistor, and the other end of the tenth resistor is connected to the primary output end of the optocoupler element.

[0015] Optionally, the control module further includes a reference power supply unit, the input end of the reference power supply unit receives an input voltage signal, the output end of the reference power supply unit is connected to one end of the first resistor, and the reference power supply unit is used to generate the first reference voltage based on the input voltage signal.

[0016] Optionally, the reference power supply unit shown includes a second three-terminal voltage regulator, a third voltage divider resistor, a fourth voltage divider resistor and a fifth voltage divider resistor; one end of the third voltage divider resistor receives the input voltage signal, and the other end of the third voltage divider resistor is connected to one end of the fourth voltage divider resistor; the other end of the fourth voltage divider resistor is connected to one end of the fifth voltage divider resistor; the other end of the fifth voltage divider resistor is grounded; the reference pole of the second three-terminal voltage regulator is connected to the other end of the fourth voltage divider resistor, the negative pole of the second three-terminal voltage regulator is connected to the other end of the third voltage divider resistor, and the positive pole of the second three-terminal voltage regulator is grounded.

[0017] Optionally, the reference power supply unit also includes a third capacitor and a fourth capacitor; one end of the third capacitor receives the input voltage signal, and the other end of the third capacitor is connected to the other end of the fifth voltage divider resistor; one end of the fourth capacitor is connected to the other end of the third voltage divider resistor, and the other end of the fourth capacitor is connected to the other end of the fifth voltage divider resistor.

[0018] In the display device provided in an embodiment of the present application, a power supply module is connected to a backlight assembly that provides backlight to the display device. The power supply module generates a current signal that controls the brightness of the backlight assembly based on a drive signal. A control module is connected to the power supply module. Upon receiving a dimming signal, the control module adjusts the frequency of the drive signal based on the dimming signal. In this embodiment, the magnitude of the current signal is adjusted by adjusting the frequency of the drive signal, thereby regulating the brightness of the display device. Thus, even when the brightness is adjusted to a lower level, the current signal changes smoothly and continuously, and the current signal does not reach zero. Therefore, the embodiment of the present application can avoid screen flickering in the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the embodiments of the present application, and together with the description, are used to explain the principles of the embodiments of the present application.

[0020] The above drawings illustrate specific embodiments of the present invention, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concepts of the present invention for those skilled in the art by reference to specific embodiments.

[0021] Figure 1 This is a structural diagram of a power supply module in an example;

[0022] Figure 2 This is a structural example diagram of a display device provided in an embodiment of the present application;

[0023] Figure 3 A schematic structural diagram of another display device provided in an embodiment of the present application;

[0024] Figure 4 A schematic structural diagram of another display device provided in an embodiment of the present application;

[0025] Figure 5 is a structural diagram of a signal conversion unit in an example;

[0026] Figure 6 is a structural diagram of a signal conversion unit in another example;

[0027] Figure 7 is a structural diagram of a variable resistance unit in an example;

[0028] Figure 8 is a structural diagram of a variable resistance unit in an example;

[0029] Figure 9 A schematic structural diagram of another display device provided in an embodiment of the present application;

[0030] Figure 10 is a schematic structural diagram of a reference power supply unit in an example;

[0031] Figure 11 This is a structural schematic diagram of another display device provided in an embodiment of the present application.

[0032] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0034] Display devices are devices that display images for users to view and are widely used in various scenarios. These devices include mobile phones, computers, and televisions equipped with display screens. Display devices typically include a power supply unit to provide power to the display device.

[0035] Figure 1 This is a schematic diagram of the structure of a power supply unit in an example. Figure 1 As shown, the power supply unit includes a switch tube 210, a capacitor 220, and an inductor 230. The first end of the switch tube 210 receives the input voltage Vin, the second end of the switch tube 210 is connected to one end of the inductor 230, and the control end of the switch tube 210 receives a drive signal; the other end of the inductor 230 is connected to one end of the capacitor 220; the other end of the capacitor 220 is grounded, and the voltage across the capacitor 220 serves as the output voltage. The drive signal is typically a square wave signal, such as a pulse width modulation (PWM) signal. The switch tube is switched on and off under the control of the drive signal. The capacitor and inductor are used to charge and discharge the capacitor during the switching process of the switch tube, thereby outputting a stable voltage, thereby providing power to the display device.

[0036] In order to satisfy the user's ability to normally watch the image on the display device under different lighting conditions, the display device needs to adjust the brightness accordingly. In the related art, the magnitude of the current signal of the power supply circuit is usually adjusted by changing the duty cycle of the driving signal of the power supply unit to adjust the power of the display device, thereby achieving the adjustment of the brightness of the display device. In actual applications, the duty cycle is the ratio of the duration of the high level and the low level of the driving signal in one cycle, and the duty cycle is positively correlated with the current signal. Therefore, the brightness of the display device can be improved by increasing the duty cycle to increase the current, or the brightness of the display device can be reduced by reducing the duty cycle to reduce the current.

[0037] However, continue to refer to Figure 1When the brightness that needs to be adjusted is too low, the duty cycle will be very small, so the disconnection time of the switch tube in the power supply circuit will be relatively long, and the current flowing through the inductor (that is, the current signal of the power supply circuit) will easily drop to zero. In this way, the current signal cannot change continuously, resulting in screen flickering, which in turn reduces the user's viewing experience.

[0038] The technical solutions of the present application and the technical solutions of the present application are described in detail below with reference to specific embodiments. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in certain embodiments. In the description of the present application, unless otherwise clearly specified and limited, each term should be understood in a broad sense within the art. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0039] Figure 2 This is a structural example diagram of a display device provided in an embodiment of the present application, such as Figure 2 As shown, the display device provided in this embodiment includes: a backlight assembly 10, a power supply module 20, and a control module 30. The backlight assembly 10 is used to provide backlight for the display device. In practical applications, the backlight assembly 10 may include a light-emitting diode. The greater the current signal flowing through the backlight assembly 10, the greater the power of the backlight assembly 10, and the higher the brightness. Conversely, the smaller the current signal flowing through the backlight assembly 10, the lower the power of the backlight assembly 10, and the dimmer the brightness.

[0040] The power supply module 20 is connected to the backlight assembly 10. The power supply module 20 is used to receive a power supply input signal and, based on the power supply input signal and driven by the driving signal, generate a current signal for controlling the brightness of the backlight assembly 10. For example, the power supply module 20 can be connected to the mains, and the power supply input signal can be an AC voltage signal. The power supply module 20 generates a current signal based on the AC voltage signal and driven by the driving signal. The power supply module 20 may include the following: Figure 1 The power supply unit shown in the example includes a switch tube 210 , an inductor 230 and a capacitor 220 .

[0041] like Figure 2 In the example, the control module 30 is connected to the power supply module 20 and is configured to provide a driving signal. Upon receiving a dimming signal, the control module 30 adjusts the frequency of the driving signal based on the dimming signal. In practical applications, the dimming signal is typically generated based on a user's dimming requirements or automatically adapted to the current light conditions. For example, the display device may further include a mainboard, which is connected to the control module 30 and generates a corresponding dimming signal based on the user's dimming requirements.

[0042] The dimming principle of this embodiment will be introduced below. Figure 1 , the current (i.e., the current signal) flowing through the inductor 230 is calculated as follows:

[0043]

[0044] In actual application, continue to refer to Figure 1 In the example, the input voltage V in , output voltage V out and the inductance L are all quantitative. Wherein D is the duty cycle of the driving signal, that is, the duty cycle is the ratio of the duration of the high level and the low level of the driving signal in one cycle, and f is the frequency of the driving signal. It can be understood that in the related art, I0 is adjusted by changing the duty cycle D. When D is too small, the switch tube 210 is disconnected for too long, and I0 may be 0, so the screen flicker phenomenon will occur. In this embodiment, the magnitude of the current I0 is controlled by adjusting the frequency f of the driving signal. It can be seen from the above formula that when the required brightness is low, the frequency f of the driving signal is increased, and the duty cycle will not be affected when the frequency is adjusted, and the duty cycle D remains relatively unchanged. In this way, even when adjusted to a lower brightness, the frequency f is very high, and the current signal I0 changes smoothly and continuously, and the current signal I0 will not be zero, so the screen flicker phenomenon will not occur.

[0045] The following is an exemplary description of the adjustment process of the frequency f of the driving signal: Figure 3 A structural diagram of another display device provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the control module 30 includes: a processing unit 310 and an external resistor unit 320 with adjustable resistance;

[0046] The external resistor unit 320 is used to adjust the resistance value of the external resistor unit 320 according to the dimming signal;

[0047] The RT pin of the processing unit 310 is connected to one end of the external resistance unit 320 , and the other end of the external resistance unit 320 is grounded. The processing unit 310 is used to generate a driving signal of a corresponding frequency based on the current resistance value of the external resistance unit 320 .

[0048] In actual applications, the processing unit 310 can be a processing chip such as a CPU or a GPU. The RT pin is the external oscillation frequency timing resistor pin of the processing unit 310. Usually, an external resistor connected to the RT pin is used to set the frequency of the drive signal. The calculation formula for the frequency f of the drive signal can be: f=1 / RT*CT, where RT is the resistance of the external resistor of the RT pin of the processing unit 310, and CT is the capacitance of the internal capacitor of the processing unit 310. Based on the above formula, this example connects the external resistor unit 320 to the RT pin. Since the resistance of the external resistor unit 320 is variable, the frequency of the drive signal also changes with the resistance of the external resistor unit 320 during operation.

[0049] The control module in this example includes a processing unit and an external resistance unit with variable resistance, and the RT pin of the processing unit is connected to the external resistance unit. By controlling the resistance of the external resistance unit, the frequency of the driving signal can be regulated, and then the current signal can be adjusted, so that the display device can avoid screen flickering when the brightness is too low.

[0050] Based on the above examples, some examples Figure 4 A structural diagram of another display device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the external resistance unit 320 includes a signal conversion unit 330 and a variable resistance unit 340;

[0051] The input end of the signal conversion unit 330 receives the dimming signal, and the output end of the signal conversion unit 330 is connected to the variable resistor unit 340. The signal conversion unit 330 is used to receive the dimming signal and convert the dimming signal into a DC level signal;

[0052] The variable resistor unit 340 is configured to adjust its own resistance based on the DC level signal.

[0053] In actual applications, the dimming signal is usually a square wave signal generated by the mainboard. The square wave signal is not easy to directly control the resistance of the variable resistor unit 340. For this reason, in this example, the square wave signal is converted into a DC level signal through the signal conversion unit 330. The variable resistor unit 340 receives the DC level signal and controls the size of its own resistance according to the size of the DC level signal. Therefore, this example can realize the control of the resistance of the variable resistor unit 340 itself according to the control signal, and then realize the control of the frequency of the driving signal.

[0054] Furthermore, in some examples, Figure 5 FIG. 1 is a structural diagram of a signal conversion unit in an example. Figure 5 As shown, the signal conversion unit 330 includes a first resistor 331, a second resistor 332, a third resistor 333, a first switch element 334 and a first capacitor 335.

[0055] One end of the first resistor 331 receives the first reference voltage, and the other end of the first resistor 331 is connected to one end of the second resistor 332; the other end of the second resistor 332 is grounded;

[0056] One end of the third resistor 333 is connected to the other end of the first resistor 331, and the other end of the third resistor 333 is connected to the first end of the first switch element 334; the second end of the first switch element 334 is connected to the other end of the second resistor 332, and the control end of the first switch element 334 receives the dimming signal;

[0057] One end of the first capacitor 335 is connected to one end of the third resistor 333 , and the other end of the first capacitor 335 is connected to the second end of the first switch element 334 ; the other end of the first resistor 331 serves as the output end of the signal conversion unit 330 and is connected to the variable resistance unit 340 .

[0058] In this example, the first reference voltage is used as the power supply voltage, and its size can be set according to the power of the display device. For example, the power of the display device is relatively large, and the first reference power supply voltage is relatively large. The first resistor 331 and the second resistor 332 are connected in series, and the first resistor 331 and the second resistor 332 are used to share the first reference power supply voltage. The first capacitor 335 can be a filter capacitor, which is used to stabilize the voltage at the output end of the signal conversion unit 330. The first switching element 334 can be a transistor or a field effect transistor. The first switching element 334 is turned off according to the adjustment signal, and then outputs different direct DC level signal signals. It is worth noting that the dimming signal is a square wave signal. The higher the brightness of the display device, the greater the duty cycle of the square wave signal, and the lower the output DC level signal; conversely, the lower the brightness of the display device, the smaller the duty cycle of the square wave signal, and the higher the output DC level signal.

[0059] The following is an exemplary description of the working process of this embodiment: the control end of the first switch element 334 receives a square wave signal for dimming. When the control end is at a high level, the first switch element 334 is turned on, the third resistor 333 is connected to the circuit in parallel with the second resistor 332, the total resistance decreases, the voltage at the second end of the first resistor 331 of the signal conversion unit 330 increases, and the amount of charge in the first capacitor 335 decreases. When the square wave signal is at a low level, the first switch element 334 is turned off, the third resistor 333 is not connected to the circuit, the total resistance increases, the voltage at the second end of the first resistor 331 of the signal conversion unit 330 decreases, and the voltage across the first capacitor 335 increases. When the display device wants to increase the brightness, the duty cycle of the dimming signal increases, the conduction time of the first switch element 334 is relatively long, and the output DC level signal decreases. The resistance of the variable resistor unit 340 is increased based on the DC level signal, thereby reducing the frequency of the driving signal to increase the brightness of the display device. When the display device wants to reduce the brightness, the duty cycle of the dimming signal becomes smaller, the conduction time of the first switch element 334 is relatively short, and the output DC level signal becomes higher. The resistance of the variable resistor unit 340 is lowered according to the DC level signal, thereby increasing the frequency of the driving signal to reduce the brightness of the display device.

[0060] In this example, the adjustment signal is converted into a DC level signal through the first resistor, the second resistor, the third resistor, the first switch element and the first capacitor, so that the variable resistance unit can adjust its own resistance based on the DC level signal.

[0061] Based on the above, in one embodiment, Figure 6 is a structural diagram of a signal conversion unit in another example, Figure 6 As shown, the signal conversion unit 330 further includes: a fourth capacitor 366 and a fifth resistor 337;

[0062] One end of the fourth capacitor 366 receives the dimming signal, and the other end of the fourth capacitor 366 is connected to the control end of the first switch element 334 . The fourth resistor 336 acts as a voltage divider to prevent the control end of the first switch element 334 from being subjected to excessive voltage.

[0063] One end of the fifth resistor 337 is connected to the control end of the first switch element 334, and the other end of the fifth resistor 337 is connected to the second end of the first switch element 334. The fifth resistor 337 is used to pull down the voltage at the second end of the first switch element 334 to prevent the second end of the first switch element 334 from being in a floating state when the first switch element 334 is turned off.

[0064] In this example, the fourth capacitor and the fifth resistor can avoid potential risks during the operation of the signal conversion unit, thereby ensuring stable operation of the signal conversion unit.

[0065] The variable resistance unit 340 will be exemplarily introduced below.

[0066] In one example, Figure 7 Schematic diagram of the structure of a variable resistance unit in an example. Figure 7 As shown, the variable resistance unit 340 includes: a first three-terminal regulator 341, an optical coupler element 342;

[0067] The reference electrode of the first three-terminal regulator 341 receives a DC level signal; the cathode of the first three-terminal regulator 341 is connected to the primary output terminal of the optical coupler element 342, and the cathode of the first three-terminal regulator 341 is grounded;

[0068] The primary input terminal of the optocoupler 342 receives the second reference voltage, the secondary input terminal of the optocoupler 342 is connected to the RT pin of the processing unit 310 , and the secondary output terminal of the optocoupler 342 is grounded.

[0069] In this example, a first three-terminal voltage regulator 341 is used to stabilize the voltage of the circuit. The primary side of the optocoupler 342 may include a light-emitting diode, and the secondary side includes a transistor. The optocoupler 342 is used to reduce the impedance of the secondary side when the primary side light-emitting diode becomes brighter, and increase the impedance of the secondary side when the light-emitting diode becomes darker.

[0070] During operation, when the DC level signal increases, the input voltage of the reference electrode of the first three-terminal regulator 341 increases, and the current flowing from the negative electrode to the negative electrode of the first three-stage regulator increases. This increases the current flowing through the primary side of the optocoupler 342, brightens the light-emitting diode in the optocoupler 342, and reduces the impedance of the secondary side of the optocoupler 342, thereby reducing the resistance of the variable resistor unit 340. Conversely, when the DC level signal decreases, the input voltage of the negative electrode of the first three-terminal regulator 341 decreases, and the current flowing from the negative electrode to the negative electrode of the first three-stage regulator decreases. This decreases the current flowing through the primary side of the optocoupler 342, dims the light-emitting diode in the optocoupler 342, and increases the impedance of the secondary side of the optocoupler 342, thereby increasing the resistance of the variable resistor unit 340.

[0071] The variable resistance unit in this example includes a first three-terminal regulator and an optocoupler element, which enables the resistance of the variable resistance unit to decrease as the connected DC level signal increases, and increase as the connected DC level signal decreases, thereby enabling the brightness of the display device to be controlled by controlling the frequency of the driving signal.

[0072] On the basis of the above, as an implementation method, Figure 8 FIG. 1 is a schematic diagram of the structure of a variable resistance unit in another example. Figure 8 As shown, the variable resistance unit 340 further includes: a sixth resistor 343 and a seventh resistor 344;

[0073] One end of the sixth resistor 343 is connected to the RT pin of the processing unit 310, and the other end of the sixth resistor 343 is connected to the secondary input end of the optical coupler element 342.

[0074] One end of the seventh resistor 344 is connected to the RT pin of the processing unit 310 , and the other end of the seventh resistor 344 is grounded.

[0075] In this embodiment, the sixth resistor and the seventh resistor are fixed resistors, which are configured as variable resistor units to limit the minimum resistance value of the connected processing unit, thereby first limiting the limit frequency of the driving signal to avoid damage to the power supply circuit due to the driving signal frequency being too low or too high.

[0076] In addition, based on the above embodiment, in one example, continue to refer to Figure 8 In the example, the variable resistance unit 340 further includes: a first voltage-dividing resistor 345 and a second voltage-dividing resistor 346;

[0077] One end of the first voltage-dividing resistor 345 receives a DC level signal, and the other end of the first voltage-dividing resistor 345 is connected to a reference electrode of the first three-terminal regulator 341 ;

[0078] One end of the second voltage-dividing resistor 346 is connected to the other end of the first voltage-dividing resistor 345 , and the other end of the second voltage-dividing resistor 346 is connected to the negative electrode of the first three-terminal regulator 341 .

[0079] In this example, the first and second voltage-dividing resistors act as voltage dividers to prevent damage to the first three-terminal regulator caused by an increased DC level signal. Therefore, this solution further ensures the reliability of the variable resistance unit.

[0080] In another example, continue to refer to Figure 8 Variable resistor unit 340 further includes an eighth resistor 347 , wherein one end of eighth resistor 347 is connected to the primary input terminal of optocoupler 342 , and the other end of eighth resistor 347 is connected to the primary output terminal of optocoupler 342 . In this example, eighth resistor 347 is used to ground the second reference voltage when optocoupler 342 is disconnected, thereby preventing the danger of a floating second reference voltage.

[0081] In another example, continue to refer to Figure 8 The variable resistance unit 340 further includes: a second capacitor 348, a ninth resistor 349, and a tenth resistor 351;

[0082] One end of the second capacitor 348 is connected to the other end of the first voltage-dividing resistor 345 , and the other end of the second capacitor 348 is connected to one end of the ninth resistor 349 ; the other end of the ninth resistor 349 is connected to the primary output end of the optocoupler 342 ;

[0083] One end of the tenth resistor 351 is connected to one end of the first voltage-dividing resistor 345 , and the other end of the tenth resistor 351 is connected to the primary output end of the optical coupling element 342 .

[0084] In this embodiment, the second capacitor 348 is a filter capacitor used to filter out high-frequency signals when the second reference voltage fluctuates, thereby ensuring the stability of the second reference voltage and preventing it from affecting the optocoupler 342. The ninth resistor 349 is used to share the voltage across the second capacitor 348 to prevent excessive voltage from breaking down the second capacitor 348.

[0085] The tenth resistor 351 is also a voltage dividing resistor, used to protect the circuit.

[0086] It should be noted that, in the above embodiment, when converting the dimming signal into a DC level signal, the stability of the first reference point voltage has a relatively large impact on the output DC level signal. For this reason, in one example, Figure 9 A structural diagram of another display device provided in an embodiment of the present application is shown in FIG. Figure 9As shown, the regulation module further includes a reference power supply unit 360; an input end of the reference power supply unit 360 receives an input voltage signal, and an output end of the reference power supply unit 360 is connected to one end of the first resistor 331. The reference power supply unit 360 is configured to generate a first reference voltage based on the input voltage signal. In this example, the reference power supply unit can provide a stable and reliable reference voltage for the external resistor unit.

[0087] In one example, Figure 10 is a schematic diagram of the structure of a reference power supply unit in an example, such as Figure 10 As shown, the reference power supply unit 360 includes: a second three-terminal voltage regulator 361, a third voltage-dividing resistor 362, a fourth voltage-dividing resistor 363 and a fifth voltage-dividing resistor 364;

[0088] One end of the third voltage-dividing resistor 362 receives the input voltage signal, and the other end of the third voltage-dividing resistor 362 is connected to one end of the fourth voltage-dividing resistor 363; the other end of the fourth voltage-dividing resistor 363 is connected to one end of the fifth voltage-dividing resistor 364; and the other end of the fifth voltage-dividing resistor 364 is grounded.

[0089] The reference electrode of the second three-terminal voltage regulator 361 is connected to the other end of the fourth voltage-dividing resistor 363 , the negative electrode of the second three-terminal voltage regulator 361 is connected to the other end of the third voltage-dividing resistor 362 , and the negative electrode of the second three-terminal voltage regulator 361 is grounded;

[0090] The other end of the third voltage-dividing resistor 362 serves as an output end of the reference power supply unit 360 .

[0091] In this example, the input voltage signal is usually set to 12V. The third voltage-dividing resistor 362, the fourth voltage-dividing resistor 363 and the fifth voltage-dividing resistor 364 are connected in series to form a voltage-dividing circuit. The voltage of the negative pole of the second three-terminal voltage regulator 361 is a fixed value, generally set to 2.5V, which limits the voltage across the fifth voltage-dividing resistor 364 to 2.5V. Therefore, the current flowing through the reference power supply unit can be controlled according to the resistance value of the fifth voltage-dividing resistor, thereby accurately controlling the voltage at the output end of the reference power supply unit. In addition, this example can also adjust the first reference voltage by changing the fourth voltage-dividing resistor and the fifth voltage-dividing resistor to adapt to display devices of different power, so this example improves the versatility of the reference power supply unit.

[0092] In another example, continue to refer to Figure 10 , the reference power supply unit 360 further includes a third capacitor 365 and a fourth capacitor 366;

[0093] One end of the third capacitor 365 receives the input voltage signal, and the other end of the third capacitor 365 is connected to the other end of the fifth voltage-dividing resistor 364;

[0094] One end of the fourth capacitor 366 is connected to the other end of the third voltage-dividing resistor 362 , and the other end of the fourth capacitor 366 is connected to the other end of the fifth voltage-dividing resistor 364 .

[0095] In this example, the third capacitor and the fourth capacitor are filter capacitors, which are used to filter out high-frequency signals when the input voltage signal fluctuates, so as to ensure that the reference power supply unit outputs an accurate and stable first reference voltage.

[0096] The following is an exemplary introduction to the working process of this embodiment in combination with specific application scenarios: Figure 11 This is a structural diagram of another display device provided in an embodiment of the present application. Figure 11 As shown, the reference power supply unit 360 receives an input voltage signal and outputs a stable first reference voltage. Currently, in order to increase the brightness of the display device, the duty cycle of the dimming signal becomes larger, the conduction time of the first switch element 334 becomes longer, the current flowing through the first resistor 331 becomes larger, the voltage of the first capacitor 335 becomes smaller, the DC level signal becomes lower, and the reference electrode of the first three-terminal regulator 341 receives a lower DC level signal. Then, the current flowing from the negative electrode of the first three-terminal regulator 341 to the positive electrode of the first three-terminal regulator 341 becomes smaller, and then the current flowing through the primary side of the optocoupler element 342 becomes smaller, the impedance of the secondary side of the optocoupler element 342 becomes larger, and then the resistance value of the variable resistor unit becomes larger, then the frequency f of the driving signal output by the processing unit 310 becomes smaller, and the current signal output by the power supply module 20 becomes larger, thereby achieving the brightening of the backlight component 10 of the display device. On the contrary, when the brightness of the display device is to be reduced, the duty cycle of the dimming signal becomes smaller, the conduction time of the first switch element 334 becomes shorter, the current flowing through the first resistor 331 becomes smaller, the voltage of the first capacitor 335 becomes larger, the DC level signal becomes higher, and the reference electrode of the first three-terminal regulator 341 receives the higher DC level signal, then the current flowing from the negative electrode of the first three-terminal regulator 341 to the positive electrode of the first three-terminal regulator 341 increases, and then the current flowing through the primary side of the optocoupler element 342 becomes smaller, the impedance of the secondary side of the optocoupler element 342 becomes smaller, and then the resistance value of the variable resistor unit becomes smaller, then the frequency f of the driving signal output by the processing unit 310 becomes larger, and the current signal output by the power supply module 20 becomes smaller, thereby achieving dimming of the backlight component 10 of the display device.

[0097] In the display device provided in the embodiments of the present application, a power supply module is connected to a backlight assembly that provides backlight to the display device. The power supply module generates a current signal that controls the brightness of the backlight assembly based on a drive signal. A control module is connected to the power supply module. Upon receiving a dimming signal, the control module adjusts the frequency of the drive signal based on the dimming signal. In this embodiment, the magnitude of the current signal is adjusted by adjusting the frequency of the drive signal, thereby regulating the brightness of the display device. Thus, even when the brightness is adjusted to a lower level, the current signal changes smoothly and continuously, and the current signal does not reach zero. Therefore, the embodiments of the present application can avoid screen flickering in the display device.

[0098] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0099] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display device, characterized in that: It includes a control module, a power supply module and a backlight assembly, wherein the power supply module is connected to the control module and the backlight assembly respectively; The control module is configured to adjust the frequency of the driving signal according to the dimming signal when receiving the dimming signal, and generate the driving signal; The power supply module is used to receive the power supply input signal and the driving signal; Based on the power supply input signal and driven by the driving signal, a current signal for controlling the brightness of the backlight assembly is generated; wherein the magnitude of the current signal is related to the frequency of the driving signal; The backlight assembly is configured to receive the current signal and provide backlight based on the current signal.

2. The display device according to claim 1, wherein The control module includes: a processing unit and an external resistor unit with adjustable resistance; The external resistor unit is configured to adjust the resistance value of the external resistor unit according to the dimming signal; The RT pin of the processing unit is connected to one end of the external resistance unit, and the other end of the external resistance unit is grounded. The processing unit is used to generate a driving signal of a corresponding frequency based on the current resistance value of the external resistance unit.

3. The display device according to claim 2, wherein: The external resistance unit includes a signal conversion unit and a variable resistance unit; The input end of the signal conversion unit receives the dimming signal, the output end of the signal conversion unit is connected to the variable resistance unit, and the signal conversion unit is used to receive the dimming signal and convert the dimming signal into a DC level signal; The variable resistance unit is used to adjust its own resistance based on the DC level signal.

4. The display device according to claim 3, wherein: The signal conversion unit includes a first resistor, a second resistor, a third resistor, a first switch element and a first capacitor. One end of the first resistor receives a first reference voltage, the other end of the first resistor is connected to one end of the second resistor; the other end of the second resistor is grounded; One end of the third resistor is connected to the other end of the first resistor, and the other end of the third resistor is connected to the first end of the first switching element; the second end of the first switching element is connected to the other end of the second resistor, and the control end of the first switching element receives the dimming signal; One end of the first capacitor is connected to one end of the third resistor, and the other end of the first capacitor is connected to the second end of the first switch element; the other end of the first resistor serves as the output end of the signal conversion unit and is connected to the variable resistance unit.

5. The display device according to claim 4, wherein: The signal conversion unit further includes: a fourth resistor and a fifth resistor, One end of the fourth resistor receives the dimming signal, and the other end of the fourth resistor is connected to the control end of the first switch element; One end of the fifth resistor is connected to the control end of the first switch element, and the other end of the fifth resistor is connected to the second end of the first switch element.

6. The display device according to claim 3, wherein: The variable resistance unit includes: a first three-terminal voltage regulator and an optical coupler element; The reference electrode of the first three-terminal regulator receives the DC level signal; the negative electrode of the first three-terminal regulator is connected to the primary output terminal of the optocoupler element, and the positive electrode of the first three-terminal regulator is grounded; The primary input terminal of the optocoupler element receives a second reference voltage, the secondary input terminal of the optocoupler element is connected to the RT pin of the processing unit, and the secondary output terminal of the optocoupler element is grounded.

7. The display device according to claim 6, wherein: The variable resistance unit further includes: a sixth resistor and a seventh resistor; One end of the sixth resistor is connected to the RT pin of the processing unit, and the other end of the sixth resistor is connected to the secondary input end of the optocoupler element. One end of the seventh resistor is connected to the RT pin of the processing unit, and the other end of the seventh resistor is grounded.

8. The display device according to claim 7, wherein: The variable resistance unit further includes: a first voltage-dividing resistor and a second voltage-dividing resistor; One end of the first voltage-dividing resistor receives the DC level signal, and the other end of the first voltage-dividing resistor is connected to the reference electrode of the first three-terminal regulator; One end of the second voltage-dividing resistor is connected to the other end of the first voltage-dividing resistor, and the other end of the second voltage-dividing resistor is connected to the positive electrode of the first three-terminal regulator.

9. The display device according to claim 6, wherein: The variable resistance unit further includes: an eighth resistor, one end of the eighth resistor being connected to the primary input end of the optocoupler element, and the other end of the eighth resistor being connected to the primary output end of the optocoupler element.

10. The display device according to claim 8, wherein The variable resistance unit further includes: a second capacitor, a ninth resistor, and a tenth resistor; One end of the second capacitor is connected to the other end of the first voltage-dividing resistor, and the other end of the second capacitor is connected to one end of the ninth resistor; the other end of the ninth resistor is connected to the primary output end of the optocoupler element; One end of the tenth resistor is connected to one end of the first voltage-dividing resistor, and the other end of the tenth resistor is connected to the primary output end of the optocoupler element.

11. The display device according to claim 4, wherein The control module also includes a reference power supply unit, An input end of the reference power supply unit receives an input voltage signal, an output end of the reference power supply unit is connected to one end of the first resistor, and the reference power supply unit is configured to generate the first reference voltage based on the input voltage signal.

12. The display device according to claim 11, wherein The reference power supply unit shown includes a second three-terminal voltage regulator, a third voltage-dividing resistor, a fourth voltage-dividing resistor, and a fifth voltage-dividing resistor; One end of the third voltage-dividing resistor receives the input voltage signal, and the other end of the third voltage-dividing resistor is connected to one end of the fourth voltage-dividing resistor; The other end of the fourth voltage-dividing resistor is connected to one end of the fifth voltage-dividing resistor; The other end of the fifth voltage-dividing resistor is grounded; The reference electrode of the second three-terminal voltage regulator is connected to the other end of the fourth voltage-dividing resistor, the negative electrode of the second three-terminal voltage regulator is connected to the other end of the third voltage-dividing resistor, and the positive electrode of the second three-terminal voltage regulator is grounded; The other end of the third voltage-dividing resistor serves as the output end of the reference power supply unit.

13. The display device according to claim 12, wherein: The reference power supply unit further includes a third capacitor and a fourth capacitor; One end of the third capacitor receives the input voltage signal, and the other end of the third capacitor is connected to the other end of the fifth voltage-dividing resistor; One end of the fourth capacitor is connected to the other end of the third voltage-dividing resistor, and the other end of the fourth capacitor is connected to the other end of the fifth voltage-dividing resistor.

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