Management circuit, management method and display device

Abstract

The application discloses a kind of management circuit, management method and display device, management circuit is used to carry out power consumption management to display module, management circuit includes current sampling module and control module, current sampling module is used to sample the sampling current flowing through display module to obtain output voltage, sampling current and the power consumption of display module is positive correlation, output voltage is positively correlated with sampling current;Control module is used to output control signal according to the comparison result of output voltage and set threshold value, and control signal is used to control the refresh rate of display module.The management circuit of the application obtains output voltage according to the sampling current flowing through display module, and then outputs control signal according to the comparison result of output voltage and set threshold value, to control the refresh rate of display module, so as to control the power consumption of display module, so that the refresh rate of display module can be controlled according to the sampling current flowing through display module, to control the power consumption of display module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, and more particularly to a management circuit, a management method and a display device. BACKGROUND

[0002] In recent years, the refresh rate of display modules is getting higher and higher, which brings better experience, but also increases power consumption and temperature. The adverse effects of increased power consumption and temperature are also obvious, such as reduced endurance, easy to reach the liquid crystal clearing point, affecting the life and performance of electronic components, and possibly requiring additional cooling measures. In the related art, there is a lack of power consumption management technology for display modules. SUMMARY

[0003] The present application provides a management circuit, a management method and a display device.

[0004] The present application provides a management circuit for power consumption management of a display module, the management circuit comprising: a current sampling module and a control module, the current sampling module being configured to sample a sampling current flowing through the display module to obtain an output voltage, the sampling current being positively correlated with the power consumption of the display module, and the output voltage being positively correlated with the sampling current; and the control module being configured to output a control signal according to a comparison result of the output voltage and a set threshold value, the control signal being used to control the refresh rate of the display module.

[0005] In some embodiments, the set threshold value comprises a first threshold value and a second threshold value, the first threshold value being greater than the second threshold value, in the case that the output voltage is greater than the first threshold value, the control signal is a first control signal, the first control signal being used to control the refresh rate of the display module to decrease; and in the case that the output voltage is less than the second threshold value, the control signal is a second control signal, the second control signal being used to control the refresh rate of the display module to increase.

[0006] In some embodiments, in the case that the control module controls the refresh rate of the display module to decrease so that the sampling current decreases to a set range, or in the case that the control module controls the refresh rate of the display module to increase so that the sampling current increases to the set range, the control module is configured to output a third control signal, the third control signal being used to control the refresh rate of the display module to remain unchanged.

[0007] In some embodiments, when the control module controls the refresh rate of the display module to decrease to a minimum value and the sampling current is greater than a first current, the control module outputs a third control signal for controlling the refresh rate of the display module to maintain the minimum value; when the control module controls the refresh rate of the display module to increase so that the sampling current increases to a maximum value and the sampling current is less than a second current, the control module outputs the third control signal for controlling the refresh rate of the display module to maintain the maximum value.

[0008] In some embodiments, the current sampling module comprises a sampling resistor for obtaining a sampling voltage according to the sampling current flowing through the display module, and the output voltage can be obtained according to the sampling voltage; and a sampling circuit connected to the sampling resistor, for obtaining the output voltage according to the sampling voltage.

[0009] In some embodiments, the sampling circuit comprises a first resistor, a second resistor, a first operational amplifier, a transistor, a third resistor, and a second operational amplifier, one end of the first resistor is connected to one end of the sampling resistor, and the voltage of the first resistor is equal to the sampling voltage; one end of the second resistor is connected to the other end of the sampling resistor; the first input end of the operational amplifier is connected to the other end of the first resistor, and the second input end of the operational amplifier is connected to the other end of the second resistor; the base of the transistor is connected to the output end of the first operational amplifier, and the collector of the transistor is connected to the first resistor and the first input end of the first operational amplifier; the third resistor is connected to the emitter of the transistor, the other end of the third resistor is grounded, and the current flowing through the third resistor is equal to the current flowing through the first resistor; the input end of the second operational amplifier is connected to one end of the third resistor and the transistor, and the voltage of the output end of the second operational amplifier is equal to the voltage of the third resistor, and the voltage of the output end of the second operational amplifier is the output voltage.

[0010] In some embodiments, the control module comprises an analog-to-digital conversion module for converting the output voltage into a voltage numerical value, and the control module is configured to obtain the comparison result according to the voltage numerical value and a set numerical threshold.

[0011] In some embodiments, the control module is configured to output the control signal so that a timing controller of the display module adjusts the refresh rate of the display module according to the control signal.

[0012] In some embodiments, the set threshold value includes a first threshold value and a second threshold value, the first threshold value is greater than the second threshold value, the control signal includes a first control signal and a second control signal, in a case that the output voltage is greater than the first threshold value, the control module is configured to output the first control signal, so that the timing controller reduces the refresh rate of the display module according to the first control signal; in a case that the output voltage is less than the second threshold value, the control module is configured to output the second control signal, so that the timing controller increases the refresh rate of the display module according to the second control signal.

[0013] The embodiment of the present application provides a management method for power consumption management of a display module, the management method comprises: obtaining an output voltage, the output voltage is obtained according to a sampling current flowing through the display module, the sampling current is positively correlated with the power consumption of the display module, and the output voltage is positively correlated with the sampling current; outputting a control signal according to a comparison result of the output voltage and a set threshold value, the control signal is used for controlling a refresh rate of the display module.

[0014] The embodiment of the present application provides a display device, the display device comprises a display module and the management circuit of any one of the embodiments, and the management circuit is used for power consumption management of the display module.

[0015] The management circuit of the embodiment of the present application obtains an output voltage according to a sampling current flowing through a display module, and then outputs a control signal according to a comparison result of the output voltage and a set threshold value, so as to control a refresh rate of the display module, thereby controlling power consumption of the display module, so that the refresh rate of the display module can be controlled according to the sampling current flowing through the display module, so as to control the power consumption of the display module.

[0016] Additional aspects and advantages of the present application will be made apparent from the following description of the embodiments, which will be given for the purpose of illustration and without limitation. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 Fig. 1 is a schematic diagram of a connection of a management circuit and a display module according to an embodiment of the present application;

[0019] Figure 2 Fig. 2 is a schematic diagram of a flow of a management method according to an embodiment of the present application;

[0020] Figure 3 Fig. 3 is a schematic diagram of a flow of a management method according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein like or similar elements are denoted by the same or similar reference signs throughout the drawings. The embodiments described below are exemplary only, and are not intended to limit the present application.

[0022] Referring to Figure 1 The present embodiment provides a management circuit 100 for power consumption management of a display module 300, the management circuit 100 comprising: a current sampling module 10 and a control module 30, the current sampling module 10 being configured to sample a sampling current flowing through the display module 300 to obtain an output voltage, the sampling current being positively correlated with the power consumption of the display module 300, and the output voltage being positively correlated with the sampling current; and the control module 30 being configured to output a control signal according to a comparison result of the output voltage and a set threshold value, the control signal being configured to control a refresh rate of the display module 300.

[0023] Specifically, the display module 300 comprises an LCD module, an LED module, an OLED module, etc., and the present embodiment takes the display module 300 as an LCD module for description. The power consumption of the LCD module is positively correlated with the sampling current flowing through the LCD module, i.e., when the power consumption of the LCD module increases, the sampling current increases; and when the power consumption of the LCD module decreases, the sampling current decreases, so that the power consumption of the LCD module can be corresponded by the size of the sampling current. The output voltage is obtained by sampling the sampling current flowing through the LCD module, and the output voltage is positively correlated with the sampling current, so that the size of the sampling current can be corresponded by the size of the output voltage, and thus the size of the power consumption of the LCD module can be corresponded. The control module 30 comprises an MCU, and the MCU outputs a control signal according to a comparison result of the output voltage and a set threshold value, so as to control the refresh rate of the display module 300. The set threshold value can be set according to actual conditions, which is not limited herein.

[0024] In this way, the output voltage is obtained by the current sampling module 10 according to the sampling current, and the control module 30 outputs a control signal according to a comparison result of the output voltage and a set threshold value, so as to control the refresh rate of the display module 300, thereby controlling the power consumption of the display module 300, so that the refresh rate of the display module 300 can be controlled according to the sampling current flowing through the display module 300, so as to control the power consumption of the display module 300.

[0025] In some embodiments, the threshold value includes a first threshold value and a second threshold value, the first threshold value is greater than the second threshold value, in the case that the output voltage is greater than the first threshold value, the control signal is a first control signal, the first control signal is used to control the refresh rate of the display module 300 to decrease; in the case that the output voltage is less than the second threshold value, the control signal is a second control signal, the second control signal is used to control the refresh rate of the display module 300 to increase.

[0026] Specifically, the power consumption of the LCD module is controlled within a limited range, which can avoid excessive heating caused by excessive power consumption of the LCD module, and thus avoid damage to components or affect the display effect. When the LCD module is in a high load state, the power consumption of the LCD module increases. When the power consumption of the LCD module exceeds the maximum value of the power consumption limited range, the output voltage is greater than the first threshold value. At this time, the control signal output by the MCU is the first control signal, which is used to control the refresh rate of the LCD module to decrease, so as to control the power consumption of the LCD module to decrease, thereby avoiding damage caused by excessive heating of the device due to excessive power consumption of the LCD module. When the LCD module is in a low load state, the power consumption of the LCD module is small. When the power consumption of the LCD module is less than the minimum value of the power consumption limited range, the output voltage is less than the second threshold value. At this time, the control signal output by the MCU is the second control signal, which is used to control the refresh rate of the LCD module to increase, so as to control the power consumption of the LCD module to increase, thereby enabling users to obtain a good experience when the LCD module is in a low load state.

[0027] In this way, by outputting the first control signal by the control module 30 to control the refresh rate of the display module 300 to decrease when the output voltage is less than the first threshold value, so as to control the power consumption to decrease; and by outputting the second control signal by the control module 30 to control the refresh rate of the display module 300 to increase when the output voltage is greater than the second threshold value, so as to control the power consumption to increase, the power consumption of the display module 300 can be controlled within a limited range, thereby avoiding adverse effects caused by excessive power consumption and improving user experience.

[0028] In some embodiments, in the case that the refresh rate of the display module 300 is controlled by the control module 30 to decrease so that the sampling current decreases to a set range, or in the case that the refresh rate of the display module 300 is controlled by the control module 30 to increase so that the sampling current increases to a set range, the control module 30 is used to output a third control signal, the third control signal is used to control the refresh rate of the display module 300 to remain unchanged.

[0029] Specifically, as the refresh rate decreases, the power consumption of the LCD module decreases, so that the sampling current also decreases synchronously. When the sampling current decreases to a set range, at this time the power consumption of the LCD module has reached a limited interval, the refresh rate at the current time can meet the power consumption of the LCD module within the limited interval, therefore the MCU outputs the third control signal to control the refresh rate of the LCD module to maintain at the current refresh rate; as the refresh rate increases, the power consumption of the LCD module increases, so that the sampling current also increases synchronously. When the sampling current increases to a set range, at this time the power consumption of the LCD module has reached a limited interval, the refresh rate at the current time can meet the power consumption of the LCD module within the limited interval, therefore the MCU outputs the third control signal to control the refresh rate of the LCD module to maintain at the current refresh rate.

[0030] In this way, by controlling the refresh rate to make the sampling current decrease or increase to a set range, the control module 30 outputs the third control signal to control the refresh rate of the display module 300 to remain unchanged, so that the power consumption of the display module 300 can be maintained within a limited interval, to avoid the adverse effects caused by excessively high or low power consumption.

[0031] In some embodiments, in the case that the control module 30 controls the refresh rate of the display module 300 to decrease to a minimum value and the sampling current is greater than the first current, the control module 30 outputs the third control signal, which is used to control the refresh rate of the display module 300 to maintain at the minimum value; in the case that the control module 30 controls the refresh rate of the display module 300 to increase so that the sampling current increases to a maximum value and the sampling current is less than the second current, the control module 30 outputs the third control signal, which is used to control the refresh rate of the display module 300 to maintain at the maximum value.

[0032] Specifically, the first current is the maximum value of the set range of the sampling current, and the second current is the minimum value of the set range of the sampling current, and the first current is greater than the second current. As the refresh rate decreases, the power consumption of the LCD module decreases, so that the sampling current decreases. However, due to the influence of factors such as load, when the refresh rate decreases to the minimum value, the power consumption of the LCD module cannot decrease to the limited range, so the sampling current does not reach the set range, that is, the sampling current is greater than the first current. At this time, the MCU outputs the third control signal to control the refresh rate of the LCD module to maintain the minimum value, so that the power consumption of the LCD module can be maintained at the minimum power consumption value that can be reached. As the refresh rate increases, the power consumption of the LCD module increases, so that the sampling current increases. However, due to the influence of factors such as load, when the refresh rate increases to the maximum value, the power consumption of the LCD module cannot increase to the limited range, so the sampling current does not reach the set range, that is, the sampling current is less than the second current. At this time, the MCU outputs the third control signal to control the refresh rate of the LCD module to maintain the maximum value, so that the power consumption of the LCD module can be maintained at the maximum power consumption value that can be reached, thereby providing better experience for users. In an embodiment, the maximum current test is performed on the LCD module to obtain a maximum current value, and the first current and the second current are set according to the maximum current value. The current value of the first current is 0.8 times the maximum current value, and the current value of the second current is 0.7 times the maximum current value.

[0033] In this way, by controlling the module 30 to output the third control signal to control the refresh rate of the display module 300 to maintain the minimum value when the refresh rate decreases to the minimum value and the sampling current is still greater than the first current, so that the power consumption of the display module 300 can be maintained at the minimum power consumption value that can be reached. And by controlling the module 30 to output the third control signal to control the refresh rate of the display module 300 to maintain the maximum value when the refresh rate increases to the maximum value and the sampling current is still less than the second current, so that the power consumption of the display module 300 can be maintained at the maximum power consumption value that can be reached.

[0034] Please refer to Figure 1 In some embodiments, the current sampling module 10 includes a sampling resistor 11 and a sampling circuit 13. The sampling resistor 11 is used to obtain a sampling voltage according to the sampling current flowing through the display module 300, and the output voltage can be obtained according to the sampling voltage. The sampling circuit 13 is connected to the sampling resistor 11, and the sampling circuit 13 is used to obtain the output voltage according to the sampling voltage.

[0035] Specifically, I load The sampling current can be represented as I, one end of the sampling resistor 11 is connected to the LCD module, and the other end of the sampling resistor 11 is connected to a voltage source VDD. The sampling current I load is the current flowing through the LCD module, and the power consumption is VDD and the sampling current I loadThe product of the sampling current I and the sampling resistance R is the sampling voltage V. The sampling current I is a fixed value, and the sampling resistance R is also a fixed value, so the power consumption and the sampling current I load are positively correlated. According to the sampling current I load , the power consumption can be obtained. Whether the power consumption is within the limited range. According to the sampling current I load flowing through the display module 300, the sampling voltage V can be obtained. The sampling voltage is the voltage across the sampling resistance 11. The sampling circuit 13 can obtain the output voltage according to the sampling voltage, and output the output voltage to the MCU. The MCU outputs a control signal according to the comparison result of the output voltage and the set threshold value, so as to control the refresh rate of the LCD module, thereby controlling the power consumption of the LCD module.

[0036] In this way, the sampling resistance 11 can be obtained through the sampling resistance 11. The sampling circuit 13 can obtain the output voltage according to the sampling resistance 11. The control module 30 can output a control signal according to the comparison result of the output voltage and the set threshold value, so as to control the refresh rate of the display module 300, thereby controlling the power consumption of the display module 300, so as to avoid the adverse effects caused by too high or too low power consumption.

[0037] In some embodiments, the sampling circuit 13 includes a first resistor, a second resistor, a first operational amplifier, a transistor, a third resistor, and a second operational amplifier. One end of the first resistor is connected to one end of the sampling resistance 11, and the voltage of the first resistor is equal to the sampling voltage. One end of the second resistor is connected to the other end of the sampling resistance 11. The first input end of the operational amplifier is connected to the other end of the first resistor, and the second input end of the operational amplifier is connected to the other end of the second resistor. The base of the transistor is connected to the output end of the first operational amplifier, and the collector of the transistor is connected to the first resistor and the first input end of the first operational amplifier. The third resistor is connected to the emitter of the transistor, and the other end of the third resistor is grounded. The current flowing through the third resistor is equal to the current flowing through the first resistor. The input end of the second operational amplifier is connected to one end of the third resistor and the transistor. The voltage at the output end of the second operational amplifier is equal to the voltage at the third resistor, and the voltage at the output end of the second operational amplifier is the output voltage.

[0038] Specifically, the first input end can be a non-inverting input end, and the second input end can be an inverting input end. R sense represents the resistance of the sampling resistance 11, R g1 represents the resistance of the first resistor, R g3 represents the resistance of the third resistor, I load represents the sampling current. Since the voltages at the non-inverting input end and the inverting input end of the first operational amplifier are equal, and the input current of the first operational amplifier is extremely small, the voltage V senes at the sampling resistance 11 is equal to the voltage V Rg1 at the first resistor, i.e. V senes = V Rg1 = Rsense X load , Rg1 = V sense / R g1 . Since the input current of the second operational amplifier is also very small, I Rg3 = I Rg1 . The output voltage is equal to the voltage of the third resistance, V out = V R3 = R g3 X I Rg1 = (R g3 / R g1 ) X V senes = (R g3 / R g1 ) X R sense X I load , that is, the output voltage is positively correlated with the sampling current I load . That is, when the sampling current I load increases, the output voltage increases; when the sampling current I load decreases, the output voltage decreases, so the MCU can obtain whether the sampling current I load is within the set range according to the comparison result of the output voltage and the set threshold value.

[0039] In this way, the sampling circuit 13 can obtain the output voltage according to the sampling voltage of the sampling resistance 11, and output the output voltage to the MCU, and the output voltage is positively correlated with the sampling current, so that the MCU can obtain whether the sampling current is within the set range according to the comparison result of the output voltage and the set threshold value, and output the control signal to control the refresh rate of the display module 300, so as to control the power consumption of the display module 300.

[0040] In some embodiments, the control module 30 comprises an analog-to-digital conversion module 31, the analog-to-digital conversion module 31 is configured to convert the output voltage into a voltage value, and the control module 30 is configured to obtain a comparison result according to the voltage value and a set value threshold.

[0041] Specifically, the first threshold and the second threshold are converted into digital signals to obtain a set numerical threshold, and the set numerical threshold is recorded in a program. The analog-to-digital conversion module 31 in the MCU includes an ADC (Analog-to-digital Converter), the sampling circuit 13 samples the sampling current flowing through the sampling resistor 11 to obtain an output voltage, and outputs the output voltage to the MCU, the ADC in the MCU converts the output voltage into a voltage numerical value, the voltage numerical value is a digital signal, the MCU reads the set numerical threshold in the program, and compares the voltage numerical value with the set numerical threshold, and outputs a control signal according to the comparison result to control the refresh rate of the LCD module. When the voltage numerical value is greater than the digital signal corresponding to the first threshold, the output voltage is greater than the first threshold, the MCU outputs a first control signal to control the refresh rate of the LCD module to decrease; when the voltage numerical value is less than the digital signal corresponding to the second threshold, the output voltage is less than the second threshold, the MCU outputs a second control signal to control the refresh rate of the LCD module to increase. In an embodiment, the current value of the first current is 0.7 times the maximum current value, and the current value of the second current is 0.8 times the maximum current value, the first current and the second current are converted into corresponding digital signals, that is, the set numerical threshold is obtained, and the MCU outputs the control signal according to the set numerical threshold and the voltage numerical value to control the refresh rate of the LCD module.

[0042] In this way, the output voltage is converted into a voltage numerical value, so that the control module 30 can compare the voltage numerical value with the digital signal corresponding to the set threshold, and output a control signal according to the comparison result to control the power consumption of the LCD module.

[0043] In some embodiments, the control module 30 is configured to output a control signal to enable the timing controller of the display module 300 to adjust the refresh rate of the display module 300 according to the control signal.

[0044] Specifically, the timing controller is a TCON (Timing Controller), which can adjust the refresh rate of the LCD module by adjusting Vblanking or Hblanking. The two adjacent frames of pictures displayed by the LCD module include a first frame and a second frame, and Vblanking is the time interval between the completion of scanning of the first frame and the start of scanning of the second frame. The LCD module usually adopts a line-by-line scanning mode, and Hblanking is the time interval between two adjacent lines. The TCON can control the refresh rate of the LCD module to decrease by increasing Vblanking or Hblanking, and can control the refresh rate of the LCD module to increase by decreasing Vblanking or Hblanking.

[0045] Therefore, the control module 30 outputs a control signal to control the timing controller to adjust the refresh rate of the display module 300, so as to adjust the power consumption of the display module 300.

[0046] In some embodiments, the threshold value includes a first threshold value and a second threshold value, the first threshold value is greater than the second threshold value, the control signal includes a first control signal and a second control signal, when the output voltage is greater than the first threshold value, the control module 30 is configured to output the first control signal to make the timing controller reduce the refresh rate of the display module 300 according to the first control signal; and when the output voltage is less than the second threshold value, the control module 30 is configured to output the second control signal to make the timing controller increase the refresh rate of the display module 300 according to the second control signal.

[0047] Specifically, when the power consumption of the LCD module is greater than the maximum value of the defined interval, the sampling current is greater than the first current, and the output voltage is greater than the first threshold value, at this time, the MCU outputs the first control signal, and the TCON controls the Vblanking or Hblanking to increase according to the first control signal, so as to control the refresh rate of the LCD module to decrease, thereby controlling the power consumption of the LCD module to decrease; when the power consumption of the LCD module is less than the minimum value of the defined interval, the sampling current is greater than the second current, and the output voltage is greater than the second threshold value, at this time, the MCU outputs the second control signal, and the TCON controls the Vblanking or Hblanking to decrease according to the second control signal, so as to control the refresh rate of the LCD module to increase, thereby controlling the power consumption of the LCD module to increase.

[0048] Therefore, when the output voltage is greater than the first threshold value, the control module 30 outputs the first control signal to make the timing controller reduce the refresh rate of the display module 300 according to the first control signal, so as to reduce the power consumption of the display module 300, thereby avoiding the adverse effects caused by too high power consumption; and when the output voltage is less than the second threshold value, the control module 30 outputs the second control signal to make the timing controller increase the refresh rate of the display module 300 according to the second control signal, so as to control the power consumption of the display module 300 to increase, thereby enabling the user to obtain a better experience.

[0049] Please refer to Figure 2 The embodiment of the present application provides a management method for power consumption management of the display module 300, and the management method comprises the following steps.

[0050] 01: obtaining an output voltage, the output voltage is obtained according to a sampling current flowing through the display module 300, the sampling current is positively correlated with the power consumption of the display module 300, and the output voltage is positively correlated with the sampling current.

[0051] 02: outputting a control signal according to a comparison result of the output voltage and a set threshold value, the control signal being used to control a refresh rate of the display module 300.

[0052] Specifically, the management method of the present embodiment can be implemented by the management circuit 100 of the above-mentioned embodiments, wherein the step 01 and the step 02 can be implemented by the control module 30 in the management circuit 100, that is, the control module 30 obtains an output voltage according to a sampling current flowing through the display module 300, the sampling current and the power consumption of the display module 300 are positively correlated, and the output voltage and the sampling current are positively correlated; the control module 30 is used to output a control signal according to a comparison result of the output voltage and a set threshold value, the control signal being used to control a refresh rate of the display module 300.

[0053] The above-mentioned embodiments are the explanation and description of the management circuit 100, which are applicable to the management method of the present embodiment, and will not be repeated here.

[0054] In this way, by the current sampling module 10 in the management circuit 100 obtaining the output voltage according to the current information, and the control module 30 outputting the control signal according to the comparison result of the output voltage and the set threshold value to control the refresh rate of the display module 300, the power consumption of the display module 300 is controlled, so that the refresh rate of the display module 300 can be controlled according to the sampling current flowing through the display module 300 to control the power consumption of the display module 300.

[0055] In some embodiments, the management method further comprises:

[0056] 03: determining whether to start the power consumption management, and performing the step 01 when it is determined to start the power consumption management.

[0057] In this way, the user can choose whether to perform the power consumption management, and after it is determined to perform the power consumption management, the management circuit 100 manages the power consumption of the display module 300, so that the power consumption of the display module 300 can be maintained within a limited range.

[0058] Please refer to Figure 3 In some embodiments, the step 02 comprises:

[0059] 021: when the output voltage is greater than the first threshold value, outputting a first control signal to control the timing controller to reduce the refresh rate of the display module 300.

[0060] 022: when the output voltage is less than the second threshold value, outputting a second control signal to control the timing controller to increase the refresh rate of the display module 300.

[0061] 023: when the output voltage is less than the first threshold value and greater than the second threshold value, outputting a third control signal to control the timing controller to maintain the refresh rate of the display module 300.

[0062] Specifically, the steps 021, 022 and 023 can be implemented by the control module 30 in the management circuit 100, that is, when the output voltage is greater than the first threshold value, the control module 30 outputs the first control signal to control the TCON to reduce the refresh rate of the display module 300, so as to control the power consumption of the LCD module to be reduced; when the output voltage is less than the second threshold value, the control module 30 outputs the second control signal to control the TCON to increase the refresh rate of the display module 300, so as to control the power consumption of the LCD module to be increased; when the output voltage is less than the first threshold value and greater than the second threshold value, the control module 30 outputs the third control signal to control the TCON to maintain the refresh rate of the display module 300, so as to control the power consumption of the LCD module to be maintained unchanged.

[0063] In this way, the control module 30 outputs the control signal according to the comparison result of the output circuit and the set threshold value, so as to control the timing controller to adjust the refresh rate of the display module 300, thereby controlling the power consumption of the display module 300.

[0064] Please refer to Figure 3 In some embodiments, the step 021 comprises:

[0065] 0211: In the case that the refresh rate is reduced to the minimum value and the sampling current is greater than the first current, the third control signal is outputted to control the timing controller to maintain the refresh rate of the display module 300 as the minimum value.

[0066] The step 022 comprises:

[0067] 0221: In the case that the refresh rate is increased to the maximum value and the sampling current is less than the second current, the third control signal is outputted to control the timing controller to maintain the refresh rate of the display module 300 as the maximum value.

[0068] Specifically, the steps 0211 and 0221 can be implemented by the control module 30 in the management circuit 100, that is, in the case that the refresh rate is reduced to the minimum value and the sampling current is greater than the first current, the control module 30 outputs the third control signal to control the TCON to maintain the refresh rate of the display module 300 as the minimum value, so as to make the power consumption of the display module 300 maintain the minimum value that can be reached; in the case that the refresh rate is increased to the maximum value and the sampling current is less than the second current, the control module 30 outputs the third control signal to control the TCON to maintain the refresh rate of the display module 300 as the maximum value, so as to make the power consumption of the display module 300 maintain the maximum value that can be reached. The first current is the maximum value of the set range, and the second current is the minimum value of the set range, so when the sampling current is greater than the first current or the sampling current is less than the second current, the sampling current does not reach the set range.

[0069] Thus, when the sampling current cannot reach the set range even after adjusting the refresh rate, the control module 30 outputs a third control signal to control the timing controller to maintain the refresh rate of the display module 300 at the minimum value or the maximum value.

[0070] The display device 1000 according to the embodiments of the present application includes the display module 300 and the management circuit 100 according to any of the embodiments, and the management circuit 100 is configured to manage the power consumption of the display module 300.

[0071] Specifically, the display device 1000 can be any product or component with display function, such as a mobile phone, a liquid crystal panel, an electronic paper, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like.

[0072] Thus, the display device 1000 can control the refresh rate of the display module 300 according to the sampling current flowing through the display module 300, and control the power consumption of the display module 300, by the current sampling module 10 in the management circuit 100 obtaining the output voltage according to the current information, and the control module 30 outputting the control signal according to the comparison result of the output voltage and the set threshold value to control the refresh rate of the display module 300.

[0073] In the description of the present application, the description of the terms "one embodiment", "some embodiments”, "exemplary embodiment”, "example”, "specific example” or "some examples” means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0074] In addition, the term "connection" should be understood broadly, for example, it can include fixed connection, or detachable connection, or integral connection; it can include direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For the person skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0076] Any procedural or methodological descriptions in flow charts or otherwise described herein can be understood to represent modules, segments or portions of code that include executable instructions for implementing the specified logical function or process(es), and the scope of preferred embodiments of the present application includes additional implementations that can perform the functions in a different order, including substantially simultaneously, or in reverse order, as appropriate to the function involved, as will be understood by those skilled in the art to which embodiments of the present application pertain.

[0077] Although the embodiments of the present application have been shown and described above, it is to be understood that the above-described embodiments are merely exemplary, and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made thereto by those skilled in the art without departing from the scope of the present application.

Claims

1. A management circuit, characterized by The management circuit is used for power consumption management of the display module, and comprises: a current sampling module, which is used for sampling a sampling current flowing through the display module to obtain an output voltage, the sampling current being positively correlated with the power consumption of the display module, and the output voltage being positively correlated with the sampling current; a control module, which is used for outputting a control signal according to a comparison result of the output voltage and a set threshold value, the control signal being used for controlling a refresh rate of the display module; in a case where the control module controls the refresh rate of the display module to decrease so that the sampling current decreases to a set range, or in a case where the control module controls the refresh rate of the display module to increase so that the sampling current increases to the set range, the control module is used for outputting a third control signal, the third control signal being used for controlling the refresh rate of the display module to remain unchanged; in a case where the control module controls the refresh rate of the display module to decrease to a minimum value and the sampling current is greater than a first current, the control module outputs the third control signal, the third control signal being used for controlling the refresh rate of the display module to remain as the minimum value; in a case where the control module controls the refresh rate of the display module to increase so that the sampling current increases to a maximum value and the sampling current is less than a second current, the control module outputs the third control signal, the third control signal being used for controlling the refresh rate of the display module to remain as the maximum value, the first current being a maximum value of the set range of the sampling current, the second current being a minimum value of the set range of the sampling current, and the first current being greater than the second current.

2. The management circuit according to claim 1, characterized in that, The set threshold value comprises a first threshold value and a second threshold value, the first threshold value being greater than the second threshold value, in a case where the output voltage is greater than the first threshold value, the control signal is a first control signal, the first control signal being used for controlling the refresh rate of the display module to decrease; in a case where the output voltage is less than the second threshold value, the control signal is a second control signal, the second control signal being used for controlling the refresh rate of the display module to increase.

3. The management circuit of claim 1, wherein, The current sampling module comprises: a sampling resistor, which is used for obtaining a sampling voltage according to the sampling current flowing through the display module, and the output voltage can be obtained according to the sampling voltage; a sampling circuit, which is connected to the sampling resistor, and is used for obtaining the output voltage according to the sampling voltage.

4. The management circuit according to claim 3, characterized in that, The sampling circuit comprises: a first resistor, one end of the first resistor being connected to one end of the sampling resistor, and a voltage of the first resistor being equal to the sampling voltage; a second resistor, one end of the second resistor being connected to the other end of the sampling resistor; a first operational amplifier, a first input end of the operational amplifier being connected to the other end of the first resistor, and a second input end of the operational amplifier being connected to the other end of the second resistor; A triode, a base of the triode is connected to an output of the first operational amplifier, a collector of the triode is connected to the first resistor and a first input of the first operational amplifier; A third resistor, one end of the third resistor is connected to an emitter of the triode, the other end of the third resistor is grounded, a current flowing through the third resistor is equal to a current flowing through the first resistor; A second operational amplifier, a voltage at an output of the second operational amplifier is equal to a voltage at the third resistor, the voltage at the output of the second operational amplifier is the output voltage, and an input of the second operational amplifier is connected to the third resistor and one end of the triode.

5. The management circuit of claim 1, wherein, The control module comprises: An analog-to-digital conversion module, the analog-to-digital conversion module is configured to convert the output voltage into a voltage value, and the control module is configured to obtain the comparison result according to the voltage value and a set threshold value.

6. The management circuit of claim 1, wherein, The control module is configured to output the control signal, so that a timing controller of the display module adjusts a refresh rate of the display module according to the control signal.

7. The management circuit according to claim 6, characterized in that, The set threshold value comprises a first threshold value and a second threshold value, the first threshold value is greater than the second threshold value, the control signal comprises a first control signal and a second control signal, in a case where the output voltage is greater than the first threshold value, the control module is configured to output the first control signal, so that the timing controller reduces the refresh rate of the display module according to the first control signal; and in a case where the output voltage is less than the second threshold value, the control module is configured to output the second control signal, so that the timing controller increases the refresh rate of the display module according to the second control signal.

8. A management method characterized by, The management method is configured to manage power consumption of a display module, and the management method comprises: Obtaining an output voltage, the output voltage is obtained according to a sampling current flowing through the display module, the sampling current is positively correlated with power consumption of the display module, and the output voltage is positively correlated with the sampling current; Outputting a control signal according to a comparison result of the output voltage and a set threshold value, the control signal is configured to control a refresh rate of the display module.

9. A display device, characterized by comprising: The display device comprises a display module and the management circuit according to any one of claims 1-7, and the management circuit is configured to manage power consumption of the display module.

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