Power supply system, power supply driving method, and display device

Abstract

The present invention provides a power supply system, a power supply driving method, and a display device. The power supply system includes a power management chip, a display driver chip, and a current detection module; the current detection module is used to detect the actual load current when the display panel is lit; the display driver chip outputs a control signal to the power management chip based on the detection result, and the control signal is used to enable the power management chip to output an operating voltage signal for lighting the display panel; wherein, the power management chip and the display driver chip store control rules corresponding to the control signal and the operating voltage signal; the power management chip includes a signal adjustment module, the signal adjustment module receives the control signal, and adjusts the operating voltage signal to the voltage value corresponding to the control signal according to the control rule. The present invention controls the power management chip to adjust the voltage value of the operating voltage signal output by the power management chip based on the detection result of the current detection module, which can reduce the power consumption of the display driver chip.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a power supply system, a power supply driving method, and a display device. Background Art

[0002] Organic Light Emitting Display (OLED) devices have many advantages, such as being fully solid-state, self-luminous, wide viewing angle, wide color gamut, fast response speed, high luminous efficiency, high brightness, high contrast, ultra-thin, ultra-light, low power consumption, wide operating temperature range, the ability to produce large-size and flexible panels, and simple manufacturing process. They can achieve truly flexible displays and have received increasing attention and attention in the market in recent years.

[0003] OLED light is driven by pixel circuits. When the voltage across the two ends of the OLED is fixed when it emits light, it will cause functional waste in application scenarios such as low grayscale and low brightness. Therefore, dynamic adjustment of OLED cross-voltage technology is introduced. However, the existing technology for dynamically adjusting OLED cross-voltage increases the power consumption of the display driver chip, and the cross-voltage regulation is not precise enough. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention aims to provide a power supply system, a power supply driving method, and a display device to reduce the power consumption of the display driver chip and improve the accuracy of regulating the cross-voltage.

[0005] An embodiment of the present invention provides a power supply system, including a power management chip, a display driver chip and a current detection module;

[0006] The current detection module is used to detect the actual load current when the display panel is lit;

[0007] The display driver chip outputs a control signal to the power management chip based on the detection result, wherein the control signal is used to enable the power management chip to output an operating voltage signal for lighting the display panel;

[0008] Among them, the power management chip and the display driver chip store control rules corresponding to the control signal and the working voltage signal; the power management chip includes a signal adjustment module, which receives the control signal and adjusts the working voltage signal to the voltage value corresponding to the control signal according to the control rules.

[0009] In some embodiments, the control signal is a pulse signal, and the display driver chip includes a storage module, which stores mapping information of multiple target currents and the number of pulses of the control signal; the display driver chip outputs the control signal corresponding to the current actual load current based on the mapping information.

[0010] In some embodiments, the signal conditioning module includes a pulse counter, which is configured to receive the control signal and count the number of pulses of the pulse signal of the control signal.

[0011] In some embodiments, the operating voltage signal includes a first voltage signal and a second voltage signal output to the display panel, and a third voltage signal output to the display driver chip;

[0012] When the display panel is in the first operating mode or the second operating mode, the first voltage signal and the second voltage signal provide a power supply voltage signal for lighting the display panel; or

[0013] When the display panel is in the second operating mode, the display driver chip provides a power supply voltage signal for lighting the display panel through the third voltage signal.

[0014] In some embodiments, the power management chip and the display driver chip store therein first control rules corresponding to the first control signal, the first voltage signal, and the second voltage signal.

[0015] In some embodiments, the power management chip and the display driver chip store therein second control rules corresponding to the second control signal and the third voltage signal.

[0016] In some embodiments, the first control rule includes a correspondence rule between the number of pulses of the first control signal and the voltage values ​​of the first voltage signal and the second voltage signal.

[0017] In some embodiments, the second control rule includes a correspondence rule between the number of pulses of the second control signal and the voltage value of the third voltage signal.

[0018] In some embodiments, the current detection module includes a precision resistor and a processing unit, the first end of the processing unit is electrically connected to the first end of the precision resistor, and the second end of the processing unit is electrically connected to the second end of the precision resistor, and is used to obtain the load current when the display panel is lit by detecting the voltage difference between the two ends of the precision resistor.

[0019] An embodiment of the present invention further provides a display device, including the power supply system for the display panel as described above.

[0020] An embodiment of the present invention further provides a power supply driving method, which is applied to the power supply system described above, and the method includes:

[0021] The current detection module detects the actual load current when the display panel is lit;

[0022] The display driver chip outputs a control signal to the power management chip based on the detection result;

[0023] The power management chip outputs an operating voltage signal through the control signal to light up the display panel.

[0024] The power supply system, power supply driving method, and display device provided by the present invention have the following advantages:

[0025] The present invention uses a current detection module to detect the actual load current when the display panel is illuminated. Based on the detection result, the display driver chip then outputs a control signal to the power management chip. The signal conditioning module in the power management chip receives the control signal and, based on the control signal, adjusts the operating voltage signal to a voltage value corresponding to the control signal, thereby illuminating the display panel. By detecting the load current when the display panel is illuminated and adjusting the voltage across the OLED display panel, the voltage across the panel can be adjusted with finer current variations, reducing the power consumption of the display driver chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0027] Figure 1 is a block diagram of a display device in the prior art;

[0028] Figure 2 It is a partial schematic diagram of a pixel circuit in the prior art;

[0029] Figure 3 is the drain current characteristic curve of the field effect transistor;

[0030] Figure 4 is a schematic diagram of a power supply system provided by an embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of a power supply system provided by another embodiment of the present invention;

[0032] Figure 6 It is a schematic diagram of a power supply driving method provided by an embodiment of the present invention.

[0033] Reference numerals:

[0034] 100 Power Management Chip

[0035] 200 display driver chip

[0036] 210 Storage Module

[0037] 300 Current Detection Module

[0038] 400 display panel DETAILED DESCRIPTION

[0039] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, identical reference numerals denote identical or similar structures, and thus repetitive descriptions thereof will be omitted. The use of "or" and "either" in this specification may mean "and" or "or."

[0040] Figure 1 FIG. 1 shows a block diagram of an OLED display device in the prior art. Figure 1 As shown, the display panel is provided with pixel units P arranged in an array, and each pixel unit P is electrically connected to a corresponding pixel circuit, and the pixel circuit can drive the corresponding pixel unit P to emit light for display. Figure 2 FIG. 1 shows a partial schematic diagram of a pixel circuit. Figure 2 As shown, the pixel circuit includes a data transistor Q1, a driving transistor Q2 and a storage capacitor Cs. When the pixel circuit drives its corresponding pixel unit P to emit light, it first provides a conduction level to the gate (Gate) of the data transistor Q1, the data transistor Q1 is turned on, and the data voltage signal Vdata is transmitted from the source (Source) of the data transistor Q1 to the gate of the driving transistor Q2 and stored in the storage capacitor Cs; when the driving transistor Q2 is turned on, the driving current flows through the source and drain of the driving transistor Q2 into the two ends of the light-emitting element (OLED) to make it emit light.

[0041] Please continue reading Figure 1 and Figure 2 The display driver chip includes a DPC (driver power controller). The DPC outputs SWIRE signals according to the SWIRE protocol to control the power management chip to output ELVDD, ELVSS, and AVDD voltages. ELVDD and ELVSS provide power supply voltages for the pixel circuits, while AVDD converts the data signal into a grayscale voltage Vdata to control the display brightness of the pixel unit P.

[0042] The brightness of the OLED is related to the current flowing through the source and drain of the driving transistor Q2. The driving transistor in the pixel circuit is a field effect transistor, which includes a gate, a source, and a drain. Figure 3 The drain characteristic curve of the field effect transistor is shown, and the horizontal axis is the source-drain voltage V DS , the vertical axis is the drain current I D .like Figure 3 As shown, the drain characteristic curve includes a variable resistance region a and a saturation region b. When the gate-source voltage V GS After the channel conduction condition is met, I D First, it enters the variable resistance region a, and the drain current I D With the source-drain voltage V DS increases, when V DS Continue to increase and meet V DS =V GS -Vth (Vth is the threshold voltage of the transistor), continue to increase V DS , I D The current value remains almost unchanged, I D Entering the saturation region. Therefore, after entering the saturation region b, at V GS The unchanged situation, V DS It does not need to be set too high to meet the brightness requirements of the required display.

[0043] like Figure 2 As shown, in the pixel circuit, the voltage V across the source and drain of the driving transistor Q2 is DS The drain current I of the driver transistor is related to the magnitude of the ELVDD voltage and the ELVSS voltage. D That is, the current flowing through the OLED. Since the luminous brightness of the OLED is related to the current, when the OLED works in the saturation region, when the ELVDD voltage and the ELVSS power supply are fixed values, it will cause power waste.

[0044] To solve this technical problem, the DPC in the display driver chip in the prior art adjusts the SWIRE signal according to the set offset, and then adjusts the ELVSS voltage so that the OLED operates in the linear region (variable resistance region a) in different application scenarios. However, the DPC is currently completely controlled and identified by the display driver chip, and the offset set by the DPC is provided through grayscale / brightness / temperature settings. If it is determined by temperature, it is easily affected by external factors such as the use environment and has poor accuracy; if it is determined by grayscale, under complex images, the display driver chip needs to undergo a large number of comparison operations through grayscale judgment, which increases power consumption relatively, and the gradient set by the DPC is relatively small; if it is determined by brightness, the offset is usually based on the W / R / G / B pure color picture setting, which is difficult to represent under complex pictures and cannot achieve more precise control. Instead, various logical operations will increase the power consumption of the display driver chip.

[0045] It should be noted that in addition to OLED, display panels with the above-mentioned logic power consumption problem also include but are not limited to: Quantum Dot Light Emitting Diodes (QLED), Micro Light Emitting Diodes (Micro LED), etc.

[0046] To solve the above technical problems, an embodiment of the present invention provides a power supply system. The power supply system includes a power management chip, a display driver chip, and a current detection module; the current detection module is used to detect the actual load current when the display panel is lit; the display driver chip outputs a control signal to the power management chip based on the detection result, and the control signal is used to enable the power management chip to output an operating voltage signal for lighting the display panel; wherein the power management chip and the display driver chip internally store control rules corresponding to the control signal and the operating voltage signal; the power management chip includes a signal adjustment module, which receives the control signal and adjusts the operating voltage signal to the voltage value corresponding to the control signal according to the control rule.

[0047] The current detection module detects the load current size of the display panel in the current state. The display driver chip determines the current load condition of the display panel based on the current detection result. Then, according to the detected load condition, the display driver chip outputs the corresponding control signal to the power management chip. The power management chip adjusts the operating voltage signal to the voltage value corresponding to the control signal based on the control signal and control rules to meet the voltage regulation requirements of the display panel, which can reduce the power consumption of the display driver chip and can more finely adjust the cross-voltage size of the display panel during display.

[0048] The embodiments of the present invention will be explained below with reference to the accompanying drawings.

[0049] Figure 4 FIG. 1 shows a power supply system provided by an embodiment of the present invention. Figure 4 As shown, the power supply system includes a power management chip (Power Management IC, referred to as PMIC) 100, a display driver chip (Display Driver Integrated Circuit, referred to as DDIC) 200 and a current detection module 300, which is used to provide power for the display of the display panel 400.

[0050] Specifically, the power management chip 100 can output three voltages: a first voltage signal ELVDD, a second voltage signal ELVSS, and a third voltage signal AVDD, and provide them to the display panel 400. The first voltage signal ELVDD and the second voltage signal ELVSS are used to power the pixel circuits of the display panel 400 and serve as the main power source for the display panel 400. The first voltage signal ELVDD is a positive power supply voltage signal, and the second voltage signal ELVSS is a negative power supply voltage signal. The third voltage signal AVDD is used to power the gamma circuit of the display driver chip 200 to generate a reference voltage. The reference voltage is then provided to the source driver circuit in the display driver chip 200 to convert the data signal into grayscale voltages to control the brightness of the display panel.

[0051] The current detection module 300 is used to detect the actual load current when the display panel 400 is illuminated. The load current is, for example, the magnitude of the current flowing through the first voltage signal ELVDD or the magnitude of the current flowing through the second voltage signal ELVSS. A large value of the actual load current indicates a heavy load on the display, while a small value of the current signal indicates a light load on the display.

[0052] Specifically, in some embodiments, the current detection module includes a precision resistor and a processing unit, the precision resistor is electrically connected to the ELVDD or ELVSS signal lead of the display panel; the first end of the processing unit is electrically connected to the first end of the precision resistor, and the second end of the processing unit is electrically connected to the second end of the precision resistor, and is used to obtain the load current when the display panel is lit by detecting the voltage difference between the two ends of the precision resistor.

[0053] The display driver chip 200 outputs a control signal to the power management chip 100 based on the detection result. The control signal is used to enable the power management chip 100 to output an operating voltage signal for lighting up the display panel 400. The power management chip 100 and the display driver chip 200 store control rules corresponding to the control signal and the operating voltage signal. The power management chip 100 includes a signal conditioning module. The signal conditioning module receives the control signal and adjusts the operating voltage signal to the voltage value corresponding to the control signal according to the control rule.

[0054] Here, the operating voltage signals are the first voltage signal ELVDD and the second voltage signal ELVSS that power the pixel circuit of the display panel 400. The voltage difference between the first voltage signal ELVDD and the second voltage signal ELVSS is the source-drain voltage of the driving transistor in the pixel circuit. By controlling the voltage difference between the first voltage signal ELVDD and the second voltage signal ELVSS, the source-drain current flowing through the driving transistor can be caused to operate in the variable resistance region, thereby saving power consumption of the display panel.

[0055] Specifically, controlling the voltage difference between the first voltage signal ELVDD and the second voltage signal ELVSS is to adjust the voltage of the first voltage signal ELVDD or the second voltage signal ELVSS. The voltage of the first voltage signal ELVDD or the second voltage signal ELVSS is adjusted according to a control signal. The control signal can be a pulse signal, and the number of pulse signals can adjust the voltage of the first voltage signal ELVDD or the second voltage signal ELVSS.

[0056] Specifically, the signal adjustment module includes a pulse counter, which is used to receive the control signal and count the number of pulses of the control signal so that the signal adjustment module can adjust the voltage signal according to the control rule, that is, the correspondence between the number of pulses of the control signal and the voltage value of the voltage signal.

[0057] For example, when the control signal includes 10 pulses, the voltage value corresponding to the first voltage signal ELVDD is 6.4V, then the signal adjustment module can adjust the first voltage signal ELVDD according to the control rule, and the signal adjustment module adjusts the first voltage signal ELVDD to 6.4V; when the control signal includes the 10th pulse, the voltage value corresponding to the second voltage signal ELVSS is -4.6V, then the signal adjustment module can adjust the second voltage signal ELVSS according to the control rule, and the signal adjustment module adjusts the second voltage signal ELVSS to -4.6V.

[0058] The display panel 400 has two display modes: bright screen display and always on display (AOD) mode. The bright screen display mode means that the entire display panel is lit for display; the off screen display mode means that the entire display panel is not lit, and only part of the area of ​​the display panel is displayed. For example, the display area is only used to display time, date notification messages and other information. Other areas of the display screen except the display area are not displayed and are in a black screen state.

[0059] like Figure 4 As shown, when the display panel 400 is in the bright screen display mode, the power management chip 100 provides the panel with a first voltage signal ELVDD and a second voltage signal ELVSS.

[0060] The control signal that controls the voltage levels of the first voltage signal ELVDD and the second voltage signal ELVSS is the first control signal SWIRE1. The first control signal SWIRE1 is a pulse signal, and the number of pulse signals can control and adjust the voltage levels of the first voltage signal ELVDD and the second voltage signal ELVSS. Therefore, in some embodiments, the power management chip 100 and the display driver chip 200 internally store a first control rule. The first control rule includes a correspondence rule between the number of pulses of the first control signal SWIRE1 and the first voltage signal ELVDD and the second voltage signal ELVSS. According to the first control rule, the signal conditioning module adjusts the voltage levels of the first voltage signal ELVDD and the second voltage signal ELVSS to enable the display panel to operate in the linear region, thereby reducing power consumption during panel display.

[0061] In some embodiments, when the display panel 400 is in the screen-off mode, the power management chip 100 or the display driver chip 200 can provide the panel with a first voltage signal ELVDD and a second voltage signal ELVSS. When the power management chip 100 provides the first voltage signal ELVDD and the second voltage signal ELVSS to the display panel 400, the operating principle of adjusting the first voltage signal ELVDD and the second voltage signal ELVSS can be referred to the above-mentioned first control signal SWIRE1, and will not be further described here.

[0062] like Figure 5 As shown, in other embodiments, in screen-off mode, the display driver chip 200 provides the first voltage signal ELVDD and the second voltage signal ELVSS to the display panel 400. The power management chip 100 and the display driver chip 200 internally store a second control rule corresponding to the second control signal SWIRE2 and the third voltage signal AVDD. The second control rule includes a corresponding relationship between the number of pulses of the second control signal SWIRE2 and the third voltage signal AVDD.

[0063] The first voltage signal ELVDD and the second voltage signal ELVSS provided by the display driver chip 200 are generated by converting the AVDD voltage signal. When the first voltage signal ELVDD and the second voltage signal ELVSS in the pixel circuit of the display panel 400 are provided by the display driver chip 200, the power management chip 100 first provides the third voltage signal AVDD to the display driver chip 200. The display driver chip 200 then converts the third voltage signal AVDD into the first voltage signal ELVDD and the second voltage signal ELVSS. Finally, the display driver chip 200 provides the first voltage signal ELVDD and the second voltage signal ELVSS to the pixel circuit.

[0064] When the screen-off mode uses the display driver chip 200 to provide the first voltage signal ELVDD and the second voltage signal ELVSS to the pixel circuit, the display power consumption can be reduced, and the second control signal SWIRE2 that controls the third voltage signal AVDD can be adjusted independently without being affected by the power management chip 100.

[0065] Furthermore, as display technology matures, the functionality of display panels is becoming increasingly diverse. The power consumption of display panels varies in different display modes, which is reflected in different detection currents. For example, a display panel includes a power-saving mode, an AOD mode, and a bright screen mode. In AOD mode, since only a portion of the display screen is illuminated, the power consumption of the AOD mode can be very low, and the current used to detect the ELVDD or ELVSS current is relatively low. However, when the display panel is in bright screen mode, since the entire display panel is displaying, the detection current on the corresponding display panel will be greater than the current in AOD mode. When the display panel is in power-saving mode, the power consumption is between the bright screen mode and the AOD mode, and the corresponding detection current is between the bright screen mode and the AOD mode. To adjust the magnitude of the first voltage signal ELVDD and the second voltage signal ELVSS supplied to the display panel in multiple modes, the display driver chip 200 includes a storage module 210 that stores mapping information of multiple target currents and the number of pulse signals of the control signal. Based on the mapping information, the display driver chip 200 outputs a control signal corresponding to the current actual load current. The mapping relationship between multiple target currents and the number of pulse signals of the control signal can enable the display panel to display more current variations, thereby more finely adjusting the cross-voltage of the display panel and saving panel power consumption. The specific number of target currents is not specifically limited here and can be set by those skilled in the art according to actual needs.

[0066] The specific working process of the power management chip 100, the display driver chip 200 and the current detection module 300 is as follows: after the current detection module 300 detects the load current of the current display panel, the result of the detected load current is searched by the mapping information stored in the storage module. When the target current corresponding to the current load current is found, the number of pulse signals included in the control signal can be obtained accordingly, and the control signal with the number of pulse signals is transmitted to the power management chip 100. Based on the stored control rules, the power management chip 100 can adjust the voltage values ​​of the first voltage signal ELVDD, the second voltage signal ELVSS and the third voltage signal AVDD accordingly.

[0067] An embodiment of the present invention further provides a display device including the power supply system for the display panel described above. It should be noted that the display device provided in this embodiment can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, or a navigation system, and this embodiment does not specifically limit this.

[0068] Figure 6 The embodiment of the present invention further provides a power supply driving method, which is applied to the power supply system as described above. Figure 6 As shown, the method includes:

[0069] The current detection module detects the actual load current when the display panel is lit;

[0070] The display driver chip outputs a control signal to the power management chip based on the detection result;

[0071] The power management chip outputs an operating voltage signal through a control signal to light up the display panel.

[0072] Regarding the specific detection frequency of the current detection module, it is detected according to the change of the TE (tearing effect) signal. The TE signal is used to detect the tearing problem when the picture is refreshed during the image display process. The TE signal is generated by the display driver chip. The TE signal is a periodic pulse signal that can be used to control the pixel switching state of the display panel. During the display panel driving process, the frequency and phase changes of the TE signal are closely related to the changes in the refresh rate. Specifically, when the refresh rate of the display panel changes, the frequency and phase of the TE signal will also change accordingly.

[0073] The above power supply method can achieve all the technical effects of the power supply system, namely reducing the power consumption of the display driver chip and providing more precise adjustment for adjusting the cross-voltage of the display panel.

[0074] In summary, the power supply system, power supply driving method, and display device provided by the present invention have the following advantages:

[0075] The current detection module measures the actual load current when the display panel is illuminated. Based on this detection result, the display driver chip then outputs a control signal to the power management chip. The signal conditioning module in the power management chip receives the control signal and, based on this control signal, adjusts the operating voltage signal to the corresponding voltage value to illuminate the display panel. By adjusting the cross-voltage of the OLED display panel by detecting the load current when the display panel is illuminated, cross-voltage regulation can be controlled for more detailed images, reducing the power consumption of the display driver chip.

[0076] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A power supply system, characterized in that: Including power management chip, display driver chip and current detection module; The current detection module is used to detect the actual load current when the display panel is lit; the current detection module includes a precision resistor, and the precision resistor is electrically connected to the ELVDD or ELVSS signal lead of the display panel; The display driver chip outputs a control signal to the power management chip based on the detection result, wherein the control signal is used to enable the power management chip to output an operating voltage signal for lighting the display panel; Among them, the power management chip and the display driver chip store control rules corresponding to the control signal and the working voltage signal; the power management chip includes a signal adjustment module, which receives the control signal and adjusts the working voltage signal to the voltage value corresponding to the control signal according to the control rules.

2. The power supply system according to claim 1, characterized in that: The control signal is a pulse signal, and the display driver chip includes a storage module, which stores mapping information of multiple target currents and the number of pulses of the control signal; The display driver chip outputs the control signal corresponding to the current actual load current according to the mapping information.

3. The power supply system according to claim 2, characterized in that: The signal conditioning module includes a pulse counter, which is used to receive the control signal and count the number of pulses of the pulse signal of the control signal.

4. The power supply system according to claim 3, characterized in that: The operating voltage signal includes a first voltage signal and a second voltage signal output to the display panel, and a third voltage signal output to the display driver chip; When the display panel is in the first operating mode or the second operating mode, the first voltage signal and the second voltage signal provide power supply voltage signals for lighting the display panel; or, When the display panel is in the second operating mode, the display driver chip provides a power supply voltage signal for lighting the display panel through the third voltage signal.

5. The power supply system according to claim 4, characterized in that: The power management chip and the display driver chip store therein first control rules corresponding to the first control signal, the first voltage signal, and the second voltage signal.

6. The power supply system according to claim 5, characterized in that: The power management chip and the display driver chip store therein a second control rule corresponding to the second control signal and the third voltage signal.

7. The power supply system according to claim 6, characterized in that: The first control rule includes a correspondence rule between the number of pulses of the first control signal and the voltage values ​​of the first voltage signal and the second voltage signal.

8. The power supply system according to claim 7, characterized in that: The second control rule includes a corresponding relationship rule between the number of pulses of the second control signal and the voltage value of the third voltage signal.

9. The power supply system according to claim 1, wherein: The current detection module also includes a processing unit, a first end of the processing unit is electrically connected to the first end of the precision resistor, and a second end of the processing unit is electrically connected to the second end of the precision resistor, and is used to obtain the load current when the display panel is lit by detecting the voltage difference between the two ends of the precision resistor.

10. A display device, characterized in that: The invention comprises a power supply system according to any one of claims 1 to 9.

11. A power supply driving method, characterized in that: Applied to the power supply system according to any one of claims 1 to 9, the method comprises: The current detection module detects the actual load current when the display panel is lit; The display driver chip outputs a control signal to the power management chip based on the detection result; The power management chip outputs an operating voltage signal through the control signal to light up the display panel.

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