Driving circuit, driving method, and display device

Abstract

A driving circuit, a driving method and a display device, the driving circuit comprises a power supply module and an adjusting module, an output port of the power supply module is used for being connected with a total input port of the adjusting module and a light emitting element of the display device, the power supply module is used for transmitting a first voltage level to the light emitting element, the power supply module is also used for transmitting the first voltage level to the adjusting module, an output port of the adjusting module is connected with the light emitting element, the adjusting module is used for judging whether the first voltage level is greater than or equal to a preset voltage of the light emitting element, the preset voltage corresponds to a preset brightness of the light emitting element, when the first voltage level is less than the preset voltage, the adjusting module is also used for determining a second voltage level according to the first voltage level and a preset power of the light emitting element, the adjusting module is also used for transmitting the second voltage level to the light emitting element to increase an actual working power of the light emitting element, so as to enhance the brightness of the light emitting element, the brightness of the light emitting element and the actual working power are in a positive correlation relationship, and the problems of low brightness and local dark spots of the light emitting element are improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a driving circuit, driving method, and display device. Background Technology

[0002] Currently, display devices with light-emitting diodes (LEDs) are popular among users due to their energy efficiency and high luminous efficacy. However, in actual operation, due to voltage drop in the driving voltage of the LEDs, some LEDs exhibit low brightness and localized dark spots, resulting in abnormal display images. Summary of the Invention

[0003] The purpose of this invention is to provide a driving circuit, a driving circuit, and a display device that improves the problems of low brightness and local dark spots in the light-emitting components.

[0004] To achieve the objectives of this invention, the following technical solution is provided: In a first aspect, embodiments of this application provide a driving circuit applied to a display device. The driving circuit includes a power supply module and an adjustment module. The output port of the power supply module is connected to both the total input port of the adjustment module and the light-emitting element of the display device. The power supply module transmits a first voltage level to the light-emitting element. The power supply module also transmits the first voltage level to the adjustment module. The output port of the adjustment module is connected to the light-emitting element. The adjustment module determines whether the first voltage level is greater than or equal to a preset voltage of the light-emitting element. The preset voltage corresponds to a preset brightness of the light-emitting element. The adjustment module also determines a second voltage level based on the first voltage level and a preset power of the light-emitting element. When the first voltage level is less than the preset voltage, the adjustment module transmits the second voltage level to the light-emitting element to increase the actual operating power of the light-emitting element, thereby enhancing the brightness of the light-emitting element. The brightness of the light-emitting element is positively correlated with the actual operating power.

[0005] The driving circuit is equipped with a power supply module and an adjustment module. The power supply module provides a first level to enable the light-emitting element to emit light at a first power. The adjustment module monitors the first level in real time and supplements the second level to form a second power when the first level is lower than the preset voltage. The second power increases the actual working power of the light-emitting element to enhance its brightness. This avoids the defects of low brightness and local dark spots caused by the line voltage drop of the power supply module when only a single power supply module supplies power to the light-emitting element.

[0006] In one possible example, the adjustment module includes a first power supply, a first switching module, a first power supply port, a first voltage regulator module, and a first comparator. The first power supply is connected to one end of the first voltage regulator module, the first input port of the first comparator, the output port of the first comparator, the collector of the first switching module, and the base of the first switching module. The other end of the first voltage regulator module is grounded. The emitter of the first switching module is connected to the first power supply port and the second input port of the first comparator. The first power supply port is used to supply power to the light-emitting element. The first power supply is used to transmit a power supply level to the first power supply port through the first switching module. The first comparator is also used to turn on the first switching module when the value of the power supply level is less than or equal to the value of the second level, so as to transmit the power supply level to the first power supply port within a first preset time period.

[0007] The first voltage regulator module provides a stable reference voltage to the comparator to ensure the accuracy of the comparator's judgment. The first comparator achieves power supply compensation by controlling the on and off of the first switch module. When the value of the power supply level is less than or equal to the value of the second level, the first comparator turns on the first switch module to transmit the power supply level to the first power supply port within a first preset time period, so that the power supply level output by the first power supply port to the light-emitting element does not exceed the second level, thus avoiding the light-emitting element being too bright and causing abnormal screen display.

[0008] In one possible example, the adjustment module further includes a first voltage divider unit and a second voltage divider unit. The emitter of the first switching module is connected to the first power supply port and one end of the first voltage divider unit. The other end of the first voltage divider unit is connected to one end of the second voltage divider unit and the second input port. The other end of the second voltage divider unit is grounded.

[0009] By connecting the emitter of the first switching module to the first power supply port and one end of the first voltage divider unit, and connecting the other end of the first voltage divider unit to one end of the second voltage divider unit and the second input port, and grounding the other end of the second voltage divider unit, the voltage after voltage division is transmitted to the second input port of the first comparator, thus avoiding a large current impact on the first comparator and compromising its accuracy.

[0010] In one possible example, the adjustment module further includes a second power supply, an energy storage module, a second power supply port, a first transistor, a second switching module, a second comparator, a first capacitor, an operational amplifier, and a second voltage regulator module. The second power supply is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the source of the first transistor, the second power supply port, the first output terminal of the operational amplifier, and one end of the first capacitor. The drain of the first transistor is grounded, and the gate of the first transistor is connected to the first port of the second switching module. The second port of the second switching module is used to connect to a third power supply, and the third port of the second switching module is connected to the output port of the second comparator. The fourth port of the second comparator is used to connect to a fourth power supply, and the fifth port of the second comparator is connected to the output port of the operational amplifier and the other end of the first capacitor. The seventh port of the operational amplifier is used to connect to a fifth power supply and one end of the second voltage regulator module. The other end of the second voltage regulator module is grounded. The second power supply port is used to transmit a power supply level to the light-emitting element. The second comparator is also used to cause the charged energy storage module to transmit the power supply level to the second power supply port within a second preset time period when the power supply level is less than or equal to the second level.

[0011] The energy storage module is charged by a second power source. When compensation is needed, the energy storage module quickly releases electrical energy to the second power supply port, resulting in a fast level compensation response and avoiding voltage fluctuations caused by directly drawing power from the second power source, which could lead to flickering of the light-emitting components. At the same time, the power supply level is monitored in real time through a feedback loop composed of an operational amplifier and a first capacitor. The second comparator is also used to ensure that when the power supply level is less than or equal to the second level, the charged energy storage module transmits the power supply level to the second power supply port within a second preset time period, ensuring accurate power supply level compensation time and preventing the light-emitting components from being too bright, which could cause abnormal screen display.

[0012] In one possible example, the second switching module includes a first transistor and a second transistor. The emitter of the first transistor is connected to the gate of the first transistor and the emitter of the second transistor. The collector of the first transistor is grounded. The base of the first transistor is connected to the base of the second transistor and the output port of the second comparator. The collector of the second transistor is used to input a sixth power supply.

[0013] The push-pull drive structure, composed of a first transistor and a second transistor, provides a larger gate drive current compared to a single-transistor drive, thereby increasing the switching speed of the first transistor and shortening the response delay of the compensation circuit. At the same time, the push-pull drive structure can quickly discharge the parasitic capacitance charge on the gate of the first transistor, preventing the first transistor from being mis-turned on.

[0014] In one possible example, the adjustment module further includes a unidirectional diode, the anode of which is connected to the other end of the energy storage module and the source of the first transistor, and the cathode of which is connected to the second power supply port, the first output terminal of the operational amplifier, and one end of the first capacitor.

[0015] By adding a unidirectional diode between the energy storage module and the second power supply port, the unidirectional conductivity of the diode is used to block the reverse flow of current from the second power supply port into the energy storage module. This prevents the energy storage module from being reverse charged or accidentally discharged during the non-compensation phase. At the same time, the diode can also prevent the current from the power supply module from flowing back into the regulation module through the second power supply port, protecting the components of the regulation module from reverse voltage damage.

[0016] Secondly, an embodiment of this application provides a driving method, which is applied to a driving circuit as described in the first aspect or any embodiment of the first aspect. The driving circuit is applied to a display device, and the driving circuit includes a power supply module and an adjustment module. The output port of the power supply module is connected to both the total input port of the adjustment module and the light-emitting element of the display device. The power supply module is used to transmit a first voltage level to the light-emitting element. The power supply module is also used to transmit the first voltage level to the adjustment module. The output port of the adjustment module is connected to the light-emitting element. The method includes: The adjustment module determines whether the first level is greater than or equal to the preset voltage of the light-emitting element, and the preset voltage corresponds to the preset brightness of the light-emitting element; The adjustment module determines the second level based on the first level and the preset power of the light-emitting element; When the first voltage level is less than the preset voltage, the second voltage level is transmitted to the light-emitting element through the adjustment module to increase the actual working power of the light-emitting element, thereby enhancing the brightness of the light-emitting element. The brightness of the light-emitting element is positively correlated with the actual working power.

[0017] In one possible example, the regulation module includes a first power supply, a first switching module, a first power supply port, a first voltage regulator module, and a first comparator. The first power supply is connected to one end of the first voltage regulator module, the first input port of the first comparator, the output port of the first comparator, the collector of the first switching module, and the base of the first switching module. The other end of the first voltage regulator module is grounded. The emitter of the first switching module is connected to the first power supply port, and the second input port of the first comparator is connected. The first power supply is used to transmit a power supply level to the first power supply port through the first switching module. The method further includes: When the value of the power supply level is less than or equal to the value of the second level, the first comparator turns on the first switch module to transmit the power supply level to the first power supply port within a first preset time period. Power is supplied to the light-emitting element through the first power supply port.

[0018] In one possible example, the regulating module further includes a second power supply, an energy storage module, a second power supply port, a first transistor, a second switching module, a second comparator, a first capacitor, an operational amplifier, and a second voltage regulator module. The second power supply is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the source of the first transistor, the second power supply port, the first output terminal of the operational amplifier, and one end of the first capacitor. The drain of the first transistor is grounded, and the gate of the first transistor is connected to the first port of the second switching module. The second port of the second switching module is used to connect to a third power supply, the third port of the second switching module is connected to the output port of the second comparator, the fourth port of the second comparator is used to connect to a fourth power supply, the fifth port of the second comparator is connected to the output port of the operational amplifier and the other end of the first capacitor, and the seventh port of the operational amplifier is used to connect to a fifth power supply and one end of the second voltage regulator module. The other end of the second voltage regulator module is grounded. The method further includes: When the power supply level is less than or equal to the second level, the second comparator enables the charged energy storage module to transmit the power supply level to the second power supply port within a second preset time period. The power supply level is transmitted to the light-emitting element through the second power supply port.

[0019] Thirdly, according to an embodiment of this application, a display device includes a timing controller and a driving circuit as described in the first aspect or any embodiment of the first aspect. The timing controller is electrically connected to the driving circuit and is used to transmit timing signals of the driving circuit to the driving circuit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first structure of a driving circuit according to one embodiment; Figure 2 This is a schematic diagram of the second structure of a driving circuit according to one embodiment; Figure 3 This is a flowchart of a driving method for one embodiment; Figure 4 This is a schematic diagram of the structure of a display device according to one embodiment.

[0021] Explanation of reference numerals in the attached figures: 10-Regulation module, 101-Main input port, 102-First power supply, 103-First switching module, 104-First power supply port, 105-First voltage regulator module, 106-First comparator, 107-First voltage detection unit, 108-First resistor, 109-Second resistor, 110-Third resistor, 111-Fourth resistor, 112-Voltage regulator resistor, 113-Filter capacitor, 200-Second power supply, 201-Energy storage module, 202-Second power supply port, 203-First transistor, 204-Second switching module, 205-Second comparator, 2 06-First capacitor, 207-Operational amplifier, 208-Second voltage regulator module, 209-Fifth resistor, 210-Sixth resistor, 211-Seventh resistor, 212-Eighth resistor, 214-Second voltage detection unit, 215-Ninth resistor, 216-Tenth resistor, 217-Eleventh resistor, 218-Twelfth resistor, 219-Second capacitor, 220-Third capacitor, 221-Fourth capacitor, 222-First transistor, 223-Second transistor, 30-Light-emitting element, 400-Display device, 401-Driver circuit, 402-Timing controller. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0024] The following detailed description, in conjunction with the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] Currently, display devices 400 with light-emitting diodes (LEDs) are popular among users due to their energy-saving and high luminous efficiency. However, in actual operation, due to voltage drop in the driving voltage of the LEDs in the display device 400, some LEDs exhibit low brightness and localized dark spots, resulting in abnormal display images.

[0026] For the above issues, please refer to Figure 1 , Figure 1 This is a first structural schematic diagram of a driving circuit 401 provided in an embodiment of this application. The driving circuit 401 is applied to a display device 400. The driving circuit 401 includes a power supply module and an adjustment module 10. The output port of the power supply module is connected to the total input port 101 of the adjustment module 10 and the light-emitting element 30 of the display device 400. The power supply module is used to transmit a first level to the light-emitting element 30 to make the light-emitting element 30. The power supply module is also used to transmit the first level to the adjustment module 10. The output port of the adjustment module 10 is connected to the light-emitting element 30. The adjustment module 10 is used to determine whether the first level is greater than or equal to a preset voltage of the light-emitting element 30. The preset voltage corresponds to a preset brightness of the light-emitting element 30. The adjustment module 10 is also used to determine a second level based on the first level and the preset power of the light-emitting element 30. When the first level is less than the preset voltage, the adjustment module 10 is also used to transmit the second level to the light-emitting element 30 to increase the actual working power of the light-emitting element 30, so as to enhance the brightness of the light-emitting element 30. The brightness of the light-emitting element 30 is positively correlated with the actual working power.

[0027] Optionally, the application scenario of the driving circuit 401 provided in this application embodiment includes a user, a display device 400, and a server. Optionally, the display device 400 may be a liquid crystal display (LCD), and this application does not limit the structure of the display device 400. Optionally, a user may use multiple display devices 400. Optionally, multiple display devices 400 may transmit data with a single server.

[0028] Optionally, the power supply module is a power conversion unit that provides basic electrical energy to the light-emitting element 30, typically a linear regulator. Optionally, the light-emitting element 30 is a semiconductor device that converts electrical energy into light energy, such as a light-emitting diode (LED) chip.

[0029] Optionally, the first level is the base DC voltage value output by the power supply module. Optionally, the first power is the power consumed by the light-emitting element 30 when powered only by the first level. Optionally, the preset voltage is the rated operating voltage required for the light-emitting element 30 to achieve the preset brightness.

[0030] Optionally, the preset brightness is the set target display brightness value. Optionally, the second level is the compensation DC voltage value output by the adjustment module 10, used to compensate for the deficiency of the first level. Optionally, the second power is the power consumed by the light-emitting element 30 when powered by the second level. Optionally, the actual operating power is the total power consumed by the light-emitting element 30, which is equal to the sum of the first power and the second power.

[0031] Optionally, the power supply module uses a 3.2V step-down converter as the base power supply, and its output port is connected to both the LED and the total input port 101 of the adjustment module 10. Optionally, the power supply module transmits a first level of 3.2V to the LED, causing the pixel to emit light at a first power of 9.6mW, and simultaneously transmits this first level to the adjustment module 10. The first voltage detection unit 107 of the adjustment module 10 determines that the first level of 3.2V is less than the preset voltage of 3.5V for the LED (corresponding to a preset brightness of 500 nits), and then transmits a second level of 0.3V to the LED through its output port, forming a second power of 0.9mW. At this time, the actual operating power of the LED is 10.5mW. Since the brightness of the light-emitting element 30 is positively correlated with the actual operating power, the preset brightness of 500 nits is finally achieved.

[0032] The driving circuit 401 sets up a power supply module and an adjustment module 10. The power supply module provides a first level to make the light-emitting element 30 emit light at a first power. The adjustment module 10 monitors the first level in real time and supplements a second level to form a second power when the first level is lower than a preset voltage. The second power increases the actual working power of the light-emitting element 30 to enhance the brightness of the light-emitting element 30. This avoids the defects of low brightness and local dark spots of the light-emitting element 30 caused by the line voltage drop of the power supply module when only a single power supply module supplies power to the light-emitting element 30.

[0033] Optionally, the adjustment module 10 is also used to determine a second power based on the actual operating power and the preset power of the light-emitting element 30, wherein the second power is the difference between the preset power and the actual operating power, and the adjustment module 10 is also used to determine a second level based on the second power and the actual operating current of the light-emitting element 30.

[0034] Optionally, the preset power is the rated operating power required for the light-emitting element 30 to achieve the preset brightness. Optionally, the actual operating current is the current flowing through the light-emitting element 30 during real-time operation.

[0035] Optionally, the adjustment module 10 first uses an internal current sensor to collect the actual operating current of the LED (3mA). Combining this with the first voltage level of 3.2V, it calculates the current actual operating power as 3.2V × 3mA = 9.6mW. Knowing that the preset power corresponding to the LED reaching a preset brightness of 500 nits is 10.5mW, the adjustment module 10 calculates the second power as the difference between the preset power and the actual operating power, i.e., 10.5mW - 9.6mW = 0.9mW. Then, according to Ohm's law, the adjustment module 10 divides the second power (0.9mW) by the actual operating current (3mA) to calculate the required second voltage level as 0.3V. This second voltage level is precisely output for compensation, ensuring that the pixel brightness accurately matches the preset value and avoiding brightness errors caused by current fluctuations when the compensation value is fixed.

[0036] By setting the second power to the difference between the preset power and the actual working power, and combining the second power with the actual working current of the light-emitting element 30 to determine the second level, the accurate calculation of the compensated second power is achieved. This method can dynamically adjust the compensated second level according to the real-time working status of the light-emitting element 30.

[0037] In one possible example, the regulating module 10 includes a first power supply 102, a first switching module 103, a first power supply port 104, a second resistor 109, a voltage regulating resistor 112, a filter capacitor 113, a first voltage regulating module 105, and a first comparator 106. The first power supply 102 is connected to one end of the first voltage regulating module 105, the first input port of the first comparator 106, the output port of the first comparator 106, the collector of the first switching module 103, and the base of the first switching module 103. The first voltage regulating module 105... The other end is grounded. The emitter of the first switch module 103 is connected to the first power supply port 104 and the second input port of the first comparator 106. The first power supply port 104 is used to supply power to the light-emitting element 30. The first power supply 102 is used to transmit the power supply level to the first power supply port 104 through the first switch module 103. The first comparator 106 is also used to turn on the first switch module 103 when the value of the power supply level is less than or equal to the value of the second level, so as to transmit the power supply level to the first power supply port 104 within a first preset time period.

[0038] Optionally, the adjustment module 10 further includes a first voltage divider unit and a second voltage divider unit. The first voltage divider unit includes a third resistor 110, and the second voltage divider unit includes a fourth resistor 111. The emitter of the first switch module 103 is connected to the first power supply port 104 and one end of the first voltage divider unit. The other end of the first voltage divider unit is connected to one end of the second voltage divider unit and the second input port. The other end of the second voltage divider unit is grounded.

[0039] Optionally, the first power supply 102 is an independent DC power supply providing operating power to the regulation module 10. Optionally, the first switching module 103 is a semiconductor switching device that controls the on / off state of power, and can be a transistor. Optionally, the first voltage regulator module 105 is a circuit that converts the input voltage into a stable reference voltage. Optionally, the first preset duration can be set by the timing controller 402 according to compensation requirements.

[0040] Optionally, the first power supply 102 is powered by a lithium battery with an output voltage of 3.8V. The first voltage regulator module 105 consists of a 3.3V Zener diode and a 1kΩ current-limiting resistor. The first input port of the first comparator 106 is connected to a 3.3V reference voltage, and the second input port is connected to the emitter of the first switching module 103 (NPN transistor) and the first power supply port 104. When the power supply level of the first power supply port 104 (i.e., the voltage across the light-emitting element 30) is less than or equal to the calculated second level of 0.3V, the first comparator 106 outputs a high level to the base of the first switching module 103, causing the transistor to saturate and conduct. The first power supply 102 transmits a 3.8V power supply level to the first power supply port 104 through the conducting transistor within a first preset time of 1μs, replenishing the power to the light-emitting diode.

[0041] The first voltage regulator module 105 provides a stable reference voltage to the comparator to ensure the accuracy of the comparator's judgment. The first comparator 106 achieves power supply compensation by controlling the on and off of the first switch module 103. When the value of the power supply level is less than or equal to the value of the second level, the first comparator 106 turns on the first switch module 103 to transmit the power supply level to the first power supply port 104 within a first preset time period, so that the power supply level output by the first power supply port 104 to the light-emitting element 30 will not exceed the second level, thus avoiding the light-emitting element 30 from being too bright and causing abnormal screen display.

[0042] In one possible example, please refer to Figure 2The regulating module 10 also includes a second power supply 200, an energy storage module 201, a second power supply port 202, a first transistor 203, a second switching module 204, a second comparator 205, a first capacitor 206, an operational amplifier 207, a fifth resistor 209, a sixth resistor 210, a seventh resistor 211, an eighth resistor 212, a ninth resistor 215, a tenth resistor 216, an eleventh resistor 217, a twelfth resistor 218, a second capacitor 219, a third capacitor 220, a fourth capacitor 221, and a second voltage regulator module 208. The second power supply 200 is connected to one end of the energy storage module 201, and the other end of the energy storage module 201 is connected to the source of the first transistor 203, the second power supply port 202, the first output terminal of the operational amplifier 207, and one end of the first capacitor 206. The drain of the first transistor 203 is grounded. The gate of 203 is connected to the first port of the second switching module 204. The second port of the second switching module 204 is used to connect to the third power supply. The third port of the second switching module 204 is connected to the output port of the second comparator 205. The fourth port of the second comparator 205 is used to connect to the fourth power supply. The fifth port of the second comparator 205 is connected to the output port of the operational amplifier 207 and the other end of the first capacitor 206. The seventh port of the operational amplifier 207 is used to connect to the fifth power supply and one end of the second voltage regulator module 208. The other end of the second voltage regulator module 208 is grounded. The second power supply port 202 is used to transmit the power supply level to the light-emitting element 30. The second comparator 205 is also used to cause the charged energy storage module 201 to transmit the power supply level to the second power supply port 202 within a second preset time when the power supply level is less than or equal to the second level.

[0043] Optionally, the second power supply 200 is a DC power supply specifically for providing charging power to the energy storage module 201. Optionally, the energy storage module 201 is a device capable of rapidly storing and releasing large amounts of electrical energy, and can be an inductor. Optionally, the first transistor 203 is a semiconductor switching device, and can be an N-channel enhancement-mode transistor. Optionally, the second switching module 204 is a drive circuit 401 that controls the gate voltage of the first transistor 203, used to rapidly drive the transistor to switch on and off. Optionally, the first capacitor 206 and the operational amplifier 207 form a feedback loop for filtering and stabilizing the output voltage. Optionally, the third power supply is a DC power supply providing positive power to the second switching module 204. Optionally, the fourth power supply is a high-precision DC power supply providing a reference voltage to the second comparator 205. Optionally, the fifth power supply is a DC power supply providing operating power to the operational amplifier 207. Optionally, the adjustment module 10 also includes a second voltage detection unit 214, which is used to detect the first level.

[0044] Optionally, the second power supply 200 uses a 15V DC power supply to charge a 100μF ceramic supercapacitor (energy storage module 201). The other end of the energy storage module 201 is connected to the source of an N-channel MOSFET (first transistor 203) and the anode of a unidirectional diode. The drain of the MOSFET is grounded, and the gate is connected to the second switching module 204. An operational amplifier 207 and a 1μF first capacitor 206 form a voltage follower, which collects the power supply level of the second power supply port 202 in real time and outputs it to the fifth port of the second comparator 205. The fourth port of the second comparator 205 is connected to a 12.5V fourth power supply (corresponding to a preset voltage). When the detected power supply level is less than or equal to 12.5V, a high level is output to the second switching module 204. The second switching module 204 drives the MOSFET to turn off, so that the charged supercapacitor releases energy to the second power supply port 202 within a second preset time, providing a 0.5V second level compensation to meet the high power and fast response compensation requirements of large-size backlight modules.

[0045] The energy storage module 201 is charged by the second power supply 200. When compensation is needed, the energy storage module 201 quickly releases electrical energy to the second power supply port 202, which makes the level compensation response fast and avoids voltage fluctuations caused by directly drawing power from the second power supply 200, which would cause the light-emitting element 30 to flicker. At the same time, the power supply level is monitored in real time by the feedback loop composed of the operational amplifier 207 and the first capacitor 206. The second comparator 205 is also used to transmit the power supply level to the second power supply port 202 within a second preset time when the power supply level is less than or equal to the second level. This makes the power supply level compensation time accurate and avoids the light-emitting element 30 being too bright, which would cause abnormal screen display.

[0046] In one possible example, the second switching module 204 includes a first transistor 222 and a second transistor 223. The emitter of the first transistor 222 is connected to the gate of the first transistor 203 and the emitter of the second transistor 223. The collector of the first transistor 222 is grounded. The base of the first transistor 222 is connected to the base of the second transistor 223 and the output port of the second comparator 205. The collector of the second transistor 223 is used to input a sixth power supply.

[0047] Optionally, the first transistor 222 is an NPN transistor in a push-pull drive structure, mainly used to discharge the parasitic capacitance charge on the gate of the first transistor 203. Optionally, the second transistor 223 is a PNP transistor in a push-pull drive structure, mainly used to provide charging current to the gate of the first transistor 203. Optionally, the push-pull drive structure is a symmetrical drive circuit 401 composed of two complementary transistors, which can realize a fast charging and discharging process. Optionally, the sixth power supply is a DC power supply that provides the collector power supply for the second transistor 223.

[0048] Optionally, the second switching module 204 is a complementary push-pull drive structure composed of an NPN type first transistor 222 and a PNP type second transistor 223. The collector of the first transistor 222 is grounded, and the collector of the second transistor 223 is connected to a 5V sixth power supply. The bases of the two transistors are connected to the output port of the second comparator 205, and their emitters are connected to the gate of the first transistor 203 (N-channel MOSFET). When the second comparator 205 outputs a high level, the first transistor 222 is turned on and the second transistor 223 is turned off, providing a 500mA discharge current to quickly discharge the parasitic capacitance charge on the MOSFET gate, allowing the MOSFET to turn off quickly. When the output is low, the second transistor 223 is turned on and the first transistor 222 is turned off, providing a 500mA charging current to quickly turn the MOSFET on. This push-pull structure significantly improves the switching speed of the MOSFET, meeting the stringent requirements of high refresh rate displays for compensation response speed.

[0049] The push-pull drive structure, composed of a first transistor 222 and a second transistor 223, provides a larger gate drive current compared to the single-transistor drive method. This increases the switching speed of the first transistor 203 and shortens the response delay of the compensation circuit. At the same time, the push-pull drive structure can quickly discharge the parasitic capacitance charge on the gate of the first transistor 203, preventing the first transistor 203 from being mis-turned on.

[0050] In one possible example, the adjustment module 10 also includes a unidirectional diode, the anode of which is connected to the other end of the energy storage module 201 and the source of the first transistor 203, and the cathode of which is connected to the second power supply port 202, the first output terminal of the operational amplifier 207 and one end of the first capacitor 206.

[0051] Optionally, a unidirectional diode is a semiconductor device that only allows current to flow from the anode to the cathode and has reverse blocking characteristics.

[0052] Optionally, a unidirectional diode is added between the energy storage module 201 (supercapacitor) and the second power supply port 202. The anode of the diode is connected to the positive terminal of the supercapacitor, and the cathode is connected to the second power supply port 202. When a certain backlight area needs compensation, the supercapacitor discharges to the second power supply port 202 of that area through the unidirectional diode to provide second-level compensation. When the output voltage of the power supply module in other areas suddenly increases due to load changes, the voltage of the second power supply port 202 may be higher than the voltage of the supercapacitor. At this time, the unidirectional diode uses its unidirectional conductivity to completely block the reverse current flowing from the second power supply port 202 to the supercapacitor, avoiding the supercapacitor from being reverse-charged, ensuring the charging efficiency of the energy storage module 201, and preventing current crosstalk between different backlight areas.

[0053] By adding a unidirectional diode between the energy storage module 201 and the second power supply port 202, the unidirectional conductivity of the diode is used to block the reverse flow of current from the second power supply port 202 into the energy storage module 201, thus preventing the energy storage module 201 from being reverse charged or accidentally discharged during the non-compensation phase. At the same time, the diode can also prevent the current from the power supply module from flowing back into the regulation module 10 through the second power supply port 202, protecting the components of the regulation module 10 from reverse voltage damage.

[0054] Please refer to Figure 3. Figure 3 This is a flowchart illustrating a driving method provided in an embodiment of this application. Taking the driving process of this driving method applied to a display device 400 as an example, the display device 400 may include a server or electronic device. The driving method is applied to the aforementioned driving circuit 401. The driving circuit 401 is applied to the display device 400 and includes a power supply module and an adjustment module 10. The output port of the power supply module is connected to both the total input port 101 of the adjustment module 10 and the light-emitting element 30 of the display device 400. The power supply module is used to transmit a first level to the light-emitting element 30. The power supply module is also used to transmit a first level to the adjustment module 10. The output port of the adjustment module 10 is connected to the light-emitting element 30. The driving method includes the following steps S201-S203, wherein... S201: The adjustment module 10 determines whether the first level is greater than or equal to the preset voltage of the light-emitting element 30, and the preset voltage corresponds to the preset brightness of the light-emitting element 30.

[0055] Optionally, the driving circuit 401 includes a power supply module and an adjustment module 10. The output port of the power supply module is connected to both the light-emitting element 30 and the total input port 101 of the adjustment module 10. The power supply module transmits a first level of 3.2V to the light-emitting element 30, causing the light-emitting element 30 to emit light at a first power of 9.6mW, and at the same time transmits the first level to the adjustment module 10.

[0056] S202: The adjustment module 10 determines the second level based on the first level and the preset power of the light-emitting element 30.

[0057] S203: When the first level is less than the preset voltage, the second level is transmitted to the light-emitting element 30 through the adjustment module 10 to increase the actual working power of the light-emitting element 30, so as to enhance the brightness of the light-emitting element 30. The brightness of the light-emitting element 30 is positively correlated with the actual working power.

[0058] Optionally, the adjustment module 10 can determine whether the first level of 3.2V is greater than or equal to the preset voltage of 3.5V for the light-emitting element 30 (corresponding to a preset brightness of 500 nits). When the determination result is that the first level is less than the preset voltage, the adjustment module 10 transmits a second level of 0.3V to the light-emitting element 30 through the output port, forming a second power of 0.9mW. At this time, the actual working power of the light-emitting element 30 is 10.5mW, and the brightness increases with the increase of the actual working power, eventually reaching the preset brightness of 500 nits.

[0059] In one possible example, the method also includes: The adjustment module 10 determines the second power based on the actual working power and the preset power of the light-emitting element 30. The second power is the difference between the preset power and the actual working power. The adjustment module 10 determines the second level based on the second power and the actual operating current of the light-emitting element 30.

[0060] Optionally, the actual operating current of the light-emitting element 30 is collected by the high-precision current sensor built into the adjustment module 10, which is 3mA. Combined with the first level of 3.2V, the current actual operating power is calculated to be 3.2V×3mA=9.6mW. Then, based on the preset power of 10.5mW corresponding to the light-emitting element 30 reaching a preset brightness of 500nit, the second power is determined by calculation as the difference between the preset power and the actual operating power, i.e., 10.5mW-9.6mW=0.9mW. Finally, according to Ohm's law, the second power of 0.9mW is divided by the actual operating current of 3mA to calculate the required second level of 0.3V. The adjustment module 10 accurately outputs this second level for compensation to ensure that the brightness of the light-emitting element 30 accurately matches the preset value.

[0061] In one possible example, the regulating module 10 includes a first power supply 102, a first switching module 103, a first power supply port 104, a first voltage regulator module 105, and a first comparator 106. The first power supply 102 is connected to one end of the first voltage regulator module 105, the first input port of the first comparator 106, the output port of the first comparator 106, the collector of the first switching module 103, and the base of the first switching module 103. The other end of the first voltage regulator module 105 is grounded. The emitter of the first switching module 103 is connected to the first power supply port 104, and the second input port of the first comparator 106 is connected. The first power supply 102 is used to transmit a power supply level to the first power supply port 104 through the first switching module 103. The method further includes: When the value of the power supply level is less than or equal to the value of the second level, the first comparator 106 turns on the first switch module 103 to transmit the power supply level to the first power supply port 104 within a first preset time period.

[0062] Power is supplied to the light-emitting element 30 through the first power supply port 104.

[0063] Optionally, the adjustment module 10 includes a first power supply 102, a first switching module 103 (NPN transistor), a first power supply port 104, a first voltage regulator module 105, and a first comparator 106. The first power supply 102 transmits a 3.8V power supply level to the first power supply port 104 through the first switching module 103. Then, the first comparator 106 compares the power supply level of the first power supply port 104 with a calculated second level of 0.3V in real time. When the power supply level is less than or equal to 0.3V, the first comparator 106 outputs a high level to the base of the first switching module 103, causing the transistor to saturate and conduct. After conduction, the first power supply 102 transmits a 3.8V power supply level to the first power supply port 104 within a first preset time of 1μs. Finally, power is supplied to the light-emitting element 30 through the first power supply port 104 to achieve brightness compensation.

[0064] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of a display device 400 provided in an embodiment of this application. For example... Figure 4 As shown, the display device 400 includes a timing controller 402 and a drive circuit 401 as described above. The timing controller 402 is electrically connected to the drive circuit 401 and is used to transmit timing signals of the drive circuit 401 to the drive circuit 401.

[0065] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A driving circuit, characterized in that, The driving circuit is applied to a display device. The driving circuit includes a power supply module and an adjustment module. The output port of the power supply module is connected to the total input port of the adjustment module and the light-emitting element of the display device. The power supply module is used to transmit a first level to the light-emitting element. The power supply module is also used to transmit the first level to the adjustment module. The output port of the adjustment module is connected to the light-emitting element. The adjustment module is used to determine whether the first level is greater than or equal to a preset voltage of the light-emitting element. The preset voltage corresponds to a preset brightness of the light-emitting element. When the first level is less than the preset voltage, the adjustment module is also used to determine a second level based on the first level and the preset power of the light-emitting element. The adjustment module is also used to transmit the second level to the light-emitting element to increase the actual operating power of the light-emitting element, thereby enhancing the brightness of the light-emitting element. The brightness of the light-emitting element is positively correlated with the actual operating power.

2. The driving circuit according to claim 1, characterized in that, The adjustment module includes a first power supply, a first switching module, a first power supply port, a first voltage regulator module, and a first comparator. The first power supply is connected to one end of the first voltage regulator module, the first input port of the first comparator, the output port of the first comparator, the collector of the first switching module, and the base of the first switching module. The other end of the first voltage regulator module is grounded. The emitter of the first switching module is connected to the first power supply port and the second input port of the first comparator. The first power supply port is used to supply power to the light-emitting element. The first power supply is used to transmit a power supply level to the first power supply port through the first switching module. The first comparator is also used to turn on the first switching module when the value of the power supply level is less than or equal to the value of the second level, so as to transmit the power supply level to the first power supply port within a first preset time period.

3. The driving circuit according to claim 2, characterized in that, The adjustment module further includes a first voltage divider unit and a second voltage divider unit. The emitter of the first switch module is connected to the first power supply port and one end of the first voltage divider unit. The other end of the first voltage divider unit is connected to one end of the second voltage divider unit and the second input port. The other end of the second voltage divider unit is grounded.

4. The driving circuit according to claim 1, characterized in that, The adjustment module further includes a second power supply, an energy storage module, a second power supply port, a first transistor, a second switching module, a second comparator, a first capacitor, an operational amplifier, and a second voltage regulator module. The second power supply is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the source of the first transistor, the second power supply port, the first output terminal of the operational amplifier, and one end of the first capacitor. The drain of the first transistor is grounded, and the gate of the first transistor is connected to the first port of the second switching module. The second port of the second switching module is used to connect to a third power supply, and the third port of the second switching module is connected to the output port of the second comparator. The fourth port of the second comparator is used to connect to a fourth power supply, and the fifth port of the second comparator is connected to the output port of the operational amplifier and the other end of the first capacitor. The seventh port of the operational amplifier is used to connect to a fifth power supply and one end of the second voltage regulator module. The other end of the second voltage regulator module is grounded. The second power supply port is used to transmit a power supply level to the light-emitting element. The second comparator is also used to cause the charged energy storage module to transmit the power supply level to the second power supply port within a second preset time period when the power supply level is less than or equal to the second level.

5. The driving circuit according to claim 4, characterized in that, The second switching module includes a first transistor and a second transistor. The emitter of the first transistor is connected to the gate of the first transistor and the emitter of the second transistor. The collector of the first transistor is grounded. The base of the first transistor is connected to the base of the second transistor and the output port of the second comparator. The collector of the second transistor is used to input a sixth power supply.

6. The driving circuit according to claim 4, characterized in that, The adjustment module also includes a unidirectional diode. The anode of the unidirectional diode is connected to the other end of the energy storage module and the source of the first transistor. The cathode of the unidirectional diode is connected to the second power supply port, the first output terminal of the operational amplifier, and one end of the first capacitor.

7. A driving method, characterized in that, The driving method is applied to the driving circuit as described in any one of claims 1 to 6, the driving circuit being applied to a display device, the driving circuit including a power supply module and an adjustment module, the output port of the power supply module being connected to both the total input port of the adjustment module and the light-emitting element of the display device, the power supply module being used to transmit a first level to the light-emitting element, the power supply module also being used to transmit the first level to the adjustment module, the output port of the adjustment module being connected to the light-emitting element, the method comprising: The adjustment module determines whether the first level is greater than or equal to the preset voltage of the light-emitting element, and the preset voltage corresponds to the preset brightness of the light-emitting element; The adjustment module determines the second level based on the first level and the preset power of the light-emitting element; When the first voltage level is less than the preset voltage, the second voltage level is transmitted to the light-emitting element through the adjustment module to increase the actual working power of the light-emitting element, thereby enhancing the brightness of the light-emitting element. The brightness of the light-emitting element is positively correlated with the actual working power.

8. The driving method according to claim 7, characterized in that, The adjustment module includes a first power supply, a first switching module, a first power supply port, a first voltage regulator module, and a first comparator. The first power supply is connected to one end of the first voltage regulator module, the first input port of the first comparator, the output port of the first comparator, the collector of the first switching module, and the base of the first switching module. The other end of the first voltage regulator module is grounded. The emitter of the first switching module is connected to the first power supply port, and the second input port of the first comparator is connected. The first power supply is used to transmit a power supply level to the first power supply port through the first switching module. The method further includes: When the value of the power supply level is less than or equal to the value of the second level, the first comparator turns on the first switch module to transmit the power supply level to the first power supply port within a first preset time period. Power is supplied to the light-emitting element through the first power supply port.

9. The driving method according to claim 7, characterized in that, The adjustment module further includes a second power supply, an energy storage module, a second power supply port, a first transistor, a second switching module, a second comparator, a first capacitor, an operational amplifier, and a second voltage regulator module. The second power supply is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the source of the first transistor, the second power supply port, the first output terminal of the operational amplifier, and one end of the first capacitor. The drain of the first transistor is grounded, and the gate of the first transistor is connected to the first port of the second switching module. The second port of the second switching module is connected to a third power supply, and the third port of the second switching module is connected to the output port of the second comparator. The fourth port of the second comparator is connected to a fourth power supply, and the fifth port of the second comparator is connected to the output port of the operational amplifier and the other end of the first capacitor. The seventh port of the operational amplifier is connected to a fifth power supply and one end of the second voltage regulator module, and the other end of the second voltage regulator module is grounded. The method further includes: When the power supply level is less than or equal to the second level, the second comparator enables the charged energy storage module to transmit the power supply level to the second power supply port within a second preset time period. The power supply level is transmitted to the light-emitting element through the second power supply port.

10. A display device, characterized in that, It includes a timing controller and a drive circuit as described in any one of claims 1 to 6, wherein the timing controller is electrically connected to the drive circuit and is used to transmit timing signals of the drive circuit to the drive circuit.

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