Panel power supply circuit, driving chip, display device and panel power supply system

Abstract

This invention discloses a panel power supply circuit, a driver chip, a display device, and a panel power supply system. The panel power supply circuit includes an inductor superposition module, which uses the inductors within the module to achieve voltage boost. When charging the inductor, any power input terminal, the inductor, and the ground terminal form a charging circuit. Current flows through the inductor, which converts electrical energy into magnetic energy for storage. When the charging circuit is disconnected to supply power to the load, the magnetic energy in the inductor is converted back into electrical energy at the inductor terminal. The voltage charged to the inductor is superimposed on the power input terminal. The superposition of the voltage charged to the inductor and the voltage input to the power input terminal produces a higher voltage. Furthermore, by using an inductor-based voltage boost, the energy supply to the load in the display panel is uninterrupted. This avoids the problem of limited driving capability of the driver chip caused by the charging and discharging of the capacitor in the charge pump, thereby improving the driving capability of the driver chip and expanding its application scenarios.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a panel power supply circuit, a driver chip, a display device, and a panel power supply system. Background Technology

[0002] With the development of display technology, the requirements for the driving capability of the driver chip in display devices are also getting higher and higher.

[0003] In existing display devices, the power supply architecture in which the driver chip provides power to the panel is as follows: the power supply voltage input to the driver chip is boosted by a charge pump, then regulated and bucked to generate the power supply voltage required by the panel.

[0004] However, existing display device driver chips have insufficient driving capabilities, which limits the application scenarios for providing panel power architecture within the driver chip. Summary of the Invention

[0005] This invention provides a panel power supply circuit, a driver chip, a display device, and a panel power supply system to improve the driving capability of the driver chip and expand the application scenarios of the panel power supply architecture provided internally by the driver chip.

[0006] In a first aspect, embodiments of the present invention provide a panel power supply circuit, including at least two power input terminals, a ground terminal, and at least one inductor superposition module;

[0007] The inductor superposition module is electrically connected to each power input terminal and the ground terminal respectively; the inductor superposition module includes at least one inductor, which is used to store the corresponding power supply voltage between at least one power input terminal and the ground terminal; the inductor superposition module is used to output the voltage after superimposing at least one power supply voltage through the inductor.

[0008] Optionally, at least two power input terminals include a first power input terminal and a second power input terminal.

[0009] The inductor superposition module also includes at least one charging circuit control unit, a first selection unit, and a second selection unit; wherein, the first end of the first selection unit is connected to the first power input terminal, and the first end of the second selection unit is connected to the second power input terminal; a first power supply branch is formed between the ground terminal and the second end of the first selection unit, and a second power supply branch is formed between the ground terminal and the second end of the second selection unit.

[0010] An inductor is connected between the second terminal of the first selection unit and the second terminal of the second selection unit, and / or an inductor is connected between the second terminal of the second selection unit and the output terminal of the inductor superposition module;

[0011] The charging circuit control unit is used to control the charging state of the first power supply branch to the corresponding inductor when the first selection unit is turned on; or the charging circuit control unit is used to control the charging state of the second power supply branch to the corresponding inductor when the second selection unit is turned on.

[0012] Optionally, the inductor superposition module includes a first inductor and a first charging circuit control unit; the first end of the first inductor is connected to the second end of the first selection unit, and the second end of the first inductor is connected to the second end of the second selection unit; the second end of the second selection unit is connected to the output end of the inductor superposition module; the first charging circuit control unit is connected in parallel with the second power supply branch.

[0013] Optionally, the inductor superposition module includes a second inductor and a second charging circuit control unit; the first end of the second inductor is connected to the second end of the first selection unit and the second end of the second selection unit respectively, and the second end of the second inductor is connected to the output terminal of the power supply circuit;

[0014] The first terminal of the second charging circuit control unit is electrically connected to the second terminal of the second inductor, and the second terminal of the second charging circuit control unit is connected to the ground terminal.

[0015] Optionally, the inductor superposition module also includes a reverse protection diode, which is disposed between the second terminal of the second selection unit and the output terminal of the inductor superposition module.

[0016] Optionally, the inductor superposition module is specifically used to output any power supply voltage or the voltage obtained by superimposing at least one power supply voltage through an inductor; preferably, the panel power supply circuit also includes control switches that are connected in parallel with the inductors in a one-to-one correspondence.

[0017] Optionally, the panel power supply circuit also includes a voltage regulator module that is connected one-to-one with the output terminal of the inductor superposition module. The voltage regulator module is used to process the voltage output from the output terminal of the inductor superposition module into the target voltage.

[0018] Optionally, the panel power supply circuit also includes a selection module. The input terminal of the selection module is connected to the output terminal of the inductor superposition module, the first output terminal of the selection module is electrically connected to the output terminal of the panel power supply circuit, and the second output terminal of the selection module is electrically connected to the voltage regulator module. The selection module is used to directly output the power supply voltage output by the inductor superposition module to the output terminal of the panel power supply circuit through the first output terminal when the target voltage is any power supply voltage; and to output the voltage output by the output terminal of the inductor superposition module to the voltage regulator module through the second output terminal when the target voltage is not equal to the power supply voltage.

[0019] Optionally, the panel power supply circuit includes a first inductor superposition module and a second inductor superposition module, wherein the output terminal of one of the first inductor superposition module and the second inductor superposition module is connected to a voltage inversion module, which is used to convert the input voltage into a voltage of opposite polarity.

[0020] Secondly, embodiments of the present invention also provide a driver chip, including the panel power supply circuit of the first aspect, wherein the output terminal of the panel power supply circuit is electrically connected to the power output terminal of the driver chip.

[0021] Thirdly, embodiments of the present invention also provide a display device, including the driving chip of the second aspect, and a display panel, wherein the display panel is electrically connected to the power output terminal of the driving chip, and the driving chip is used to control the voltage output to the power output terminal according to the voltage of the voltage superposition module.

[0022] Fourthly, embodiments of the present invention also provide a panel power supply system, including a driver chip as described in the second aspect, and further including a battery and a power chip, wherein the output terminal of the battery is electrically connected to the input terminal of the power chip, the output terminal of the power chip is electrically connected to the input terminal of the driver chip, and the power chip is used to provide a first power supply voltage to the first power input terminal of the panel power supply circuit in the driver chip, and to provide a second power supply voltage to the second power input terminal of the panel power supply circuit.

[0023] The technical solution of this invention includes an inductor superposition module in the panel power supply circuit. The inductor in the superposition module is used to achieve voltage boosting. When the inductor is charged, any power input terminal, the inductor, and the ground terminal form a charging circuit. Current flows through the inductor, which converts electrical energy into magnetic energy for storage. When the charging circuit is disconnected to supply power to the load, the magnetic energy in the inductor is converted back into electrical energy at the inductor terminal. The voltage of the inductor being charged is superimposed on the power input terminal. The voltage of the inductor being charged and the voltage input to the power input terminal generate a higher voltage. Furthermore, by using an inductor to boost the voltage, the energy supply to the load in the display panel is uninterrupted. This avoids the problem of limited driving capability of the driver chip caused by the charging and discharging of the capacitor in the charge pump, improves the driving capability of the driver chip, and expands the application scenarios of the driver chip in the panel power supply circuit of this embodiment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a panel power supply circuit provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of a pixel circuit in the prior art;

[0032] Figure 9 This is a schematic diagram of the structure of a voltage regulator module provided in an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the panel power supply system provided in an embodiment of the present invention. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] As described in the background section, existing display device driver chips suffer from insufficient driving capability, limiting the application scenarios of the panel power supply architecture within the driver chip. The inventors have discovered that this problem arises because existing driver chip power supply architectures utilize a charge pump for voltage boosting. This charge pump is a switched-capacitor voltage converter, a type of DC-DC converter that uses capacitor charging and discharging to achieve voltage boosting. On one hand, the driving force of the charge pump is related to the amount of charge the capacitor can store; the larger the amount of charge the capacitor can store, the stronger the driving capability of the charge pump. However, large capacitors are difficult to manufacture and have long charging times, while small capacitors can store less charge, preventing the charge pump from achieving high driving capability. On the other hand, charging the capacitor does not provide energy to the load in the display panel; energy is only provided when the capacitor discharges. Since the charging and discharging of the capacitor requires a continuous process, the power supply architecture using a charge pump to boost voltage is prone to power interruptions when supplying power to the load in the display panel. For the reasons mentioned above, the limited driving capability of the charge pump results in insufficient driving capability of the driver chip, which means that the panel power architecture provided by the driver chip can only be applied to the always-on display mode, thus limiting the application scenarios of the panel power architecture provided by the driver chip.

[0037] Based on the above reasons, embodiments of the present invention provide a panel power supply circuit, which may be included in the driver chip of the display device. This panel power supply circuit is a novel architecture that provides panel power internally to the driver chip, which is different from the architecture of providing panel power internally to the driver chip in the prior art. Figure 1 This is a schematic diagram of a panel power supply circuit provided in an embodiment of the present invention, for reference. Figure 1 The panel power supply circuit includes: an inductor superposition module 100 electrically connected to each power input terminal and ground terminal respectively; the inductor superposition module 100 includes at least one inductor L, which is used to store the power supply voltage corresponding to at least one power input terminal and ground terminal GND; the inductor superposition module 100 is used to output the voltage after superposition of at least one power supply voltage through the inductor.

[0038] Optionally, the power input terminal is used to connect to an external power source. Different power input terminals can be connected to different external power sources, and correspondingly, the power supply voltage between different power input terminals and the ground terminal GND can be different. Figure 1 The example illustrates a panel power supply circuit that includes an inductor superposition module 100 and two power input terminals (a first power input terminal V1 and a second power input terminal V2, respectively).

[0039] The following is Figure 1The following explanation uses the panel power supply circuit as an example. The first power input terminal V1 and the second power input terminal V2 can be connected to an external power source. The external power sources connected to the first power input terminal V1 and the second power input terminal V2 can be different, resulting in different input voltages to the first power input terminal V1 and the second power input terminal V2. The ground terminal GND is grounded. The voltage between the first power input terminal V1 and the ground terminal GND is the first power supply voltage, and the voltage between the second power input terminal V2 and the ground terminal GND is the second power supply voltage.

[0040] The first power input terminal V1, the second power input terminal V2, and the ground terminal GND are electrically connected to the inductor superposition module 100. The inductor superposition module 100 includes at least one inductor L, which has an energy storage function. The first power supply voltage and / or the second power supply voltage can be stored in the inductor L, and then the inductor superposition module 100 can superimpose the first power supply voltage and / or the second power supply voltage, so that the inductor superposition module 100 has a voltage boosting function. The superposition of the first power supply voltage and / or the second power supply voltage can be limited to the superposition of the first power supply voltage. Optionally, the voltage after superposition of the first power supply voltage is m times the first power supply voltage, where m>1. Alternatively, it can be limited to the superposition of the second power supply voltage, where the voltage after superposition of the second power supply voltage is n times the second power supply voltage, where n>1. Or, it can be a superposition of the first power supply voltage and the second power supply voltage. The voltage after superposition of the first power supply voltage and the second power supply voltage can be the sum of the first power supply voltage and the second power supply voltage, or it can be a voltage value greater than the first power supply voltage or the second power supply voltage. The specific superposition voltage value is related to factors such as the number of inductors L in the inductor superposition module 100 and the charging time of the inductors L.

[0041] When the inductor superposition module 100 is connected to more power input terminals, the inductor superposition module 100 outputs at least one power supply voltage superimposed by the inductors. The superimposed voltage value can be a voltage value greater than any power supply voltage.

[0042] Unlike existing charge pumps that use capacitors for voltage boosting, the panel power supply circuit in this embodiment uses inductors included in an inductor superposition module to achieve voltage boosting. When charging the inductor, any power input terminal, the inductor, and the ground terminal form a charging circuit. Current flows through the inductor, which converts electrical energy into magnetic energy for storage. When the charging circuit is disconnected to supply power to the load, the magnetic energy in the inductor is converted into electrical energy at the inductor terminal. The voltage of the inductor being charged is superimposed on the power input terminal. The voltage of the inductor being charged and the voltage input to the power input terminal will generate a higher voltage. Moreover, by using inductors for voltage boosting, the power supply to the load in the display panel is uninterrupted. This avoids the problem of limited driving capability of the driver chip caused by defects in the capacitors in the charge pump, as described in the prior art, thereby improving the driving capability of the driver chip and expanding the application scenarios of the panel power supply circuit.

[0043] Figure 2 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention, for reference. Figures 2-5 Optionally, at least two power input terminals include a first power input terminal V1 and a second power input terminal V2. The inductor superposition module 100 also includes at least one charging circuit control unit 110, a first selection unit 120, and a second selection unit 130. The first terminal of the first selection unit 120 is connected to the first power input terminal V1, and the first terminal of the second selection unit 130 is connected to the second power input terminal V2. A first power supply branch 1 is formed between the ground terminal GND and the second terminal of the first selection unit 120, and a first power supply branch 1 is formed between the ground terminal GND and the second terminal of the second selection unit 130. A second power supply branch 2 is formed; an inductor L is connected between the second terminal of the first selection unit 120 and the second terminal of the second selection unit 130, and / or an inductor L is connected between the second terminal of the second selection unit 130 and the output terminal Vout of the inductor superposition module 100; the charging circuit control unit 110 is used to control the charging state of the first power supply branch 1 to the corresponding inductor L when the first selection unit 120 is turned on; or the charging circuit control unit 110 is used to control the charging state of the second power supply branch 2 to the corresponding inductor L when the second selection unit 130 is turned on. Optionally, the first selection unit 120 includes a first selection switch K1, and the second selection unit 130 includes a second selection switch K2.

[0044] Specifically, in this embodiment, the first selection unit 120 controls whether the power supply corresponding to the first power input terminal V1 supplies power to the load, and the second selection unit 130 controls whether the power supply corresponding to the second power input terminal V2 supplies power to the load. When the first selection unit 120 is turned on, the charging circuit control unit 110 can control the charging state of the first power supply branch 1 to the corresponding inductor L, wherein the inductor L corresponding to the first power supply branch 1 is the inductor L connected between the second terminal of the first selection unit 120 and the charging circuit control unit 110, and the charging state of the inductor L includes charging and not charging. When the first selection unit 120 is turned on, the charging circuit control unit 110 controls the connection between the inductor L corresponding to the first power supply branch 1 and the ground terminal GND, thus forming an inductor charging circuit, and the first power supply branch 1 can charge the inductor L. When the charging circuit control unit 110 controls the disconnection between the inductor L corresponding to the first power supply branch 1 and the ground terminal GND, the first power supply branch 1 stops charging the inductor L. When the first selection unit 120 is turned on, the charging circuit control unit 110 can control the charging state of the corresponding inductor L in the first power supply branch 1. The inductor L corresponding to the first power supply branch 1 is the inductor L connected between the second terminal of the first selection unit 120 and the charging circuit control unit 110. The charging state of inductor L includes charging and not charging. When the second selection unit 130 is turned on, the charging circuit control unit 110 controls the connection between the inductor L corresponding to the second power supply branch 2 and the ground terminal GND, thus forming an inductor charging circuit. The second power supply branch 2 can charge inductor L. The charging circuit control unit 110 controls the disconnection between the inductor L corresponding to the second power supply branch 2 and the ground terminal GND, stopping the charging of inductor L by the second power supply branch 2. After charging inductor L through the first power supply branch 1 and / or the second power supply branch 2, powering the load again through the first power supply branch 1 or the second power supply branch 2 allows for the superposition of the first power supply voltage or the second power supply voltage and the voltage stored in inductor L, achieving a boost function.

[0045] in, Figure 2 The diagram illustrates an inductor superposition module 100 for a panel power supply circuit, including a first inductor L1 connected between the second terminal of a first selection unit 120 and the second terminal of a second selection unit 130. (Reference) Figure 2Optionally, the inductor superposition module 100 includes a first inductor L1 and a first charging circuit control unit 111; the first end of the first inductor L1 is connected to the second end of the first selection unit 120, and the second end of the first inductor L1 is connected to the second end of the second selection unit 130; the second end of the second selection unit 130 is connected to the output terminal Vout of the inductor superposition module 100; the first charging circuit control unit 111 is connected in parallel with the second power supply branch 2. Optionally, the first charging circuit control unit 111 includes a first circuit control switch K3.

[0046] refer to Figure 2 In an optional embodiment, the parallel connection point of the first charging circuit control unit 111 is between the second end of the second selection unit 130 and the output terminal Vout of the inductor superposition module 100.

[0047] refer to Figure 3 In another optional embodiment of the present invention, the parallel connection point of the first charging circuit control unit 111 is between the first inductor L1 and the second end of the second selection unit 130.

[0048] for Figure 2 and Figure 3 The working principle of the inductor superposition module 100 of the panel power supply circuit shown, which superimposes at least one of the first power supply voltage and the second power supply voltage, is as follows:

[0049] In the first case, firstly, the first selection unit 120 and the first charging circuit control unit 111 are turned on, and the power supply connected to the first power input terminal V1 is for charging the inductor L. Then the energy stored in the inductor L is V1*D.

[0050] Then, the first selection unit 120 and the first charging circuit control unit 111 are turned off, and the second selection unit 130 is turned on. The output and input satisfy the following formula:

[0051] VOUT*(1-D)=V10*D+V20(1-D);

[0052] From this, we can conclude that...

[0053] Where V10 is the first power supply voltage, V20 is the second power supply voltage, D is the proportion of charging time to the total charging and discharging time (therefore, D is a value between 0 and 1), and VOUT is the output voltage of the inductor superposition module 100. As can be seen from the above formula, the voltage output by the inductor superposition module 100 is greater than the second power supply voltage, and the magnitude of the voltage output by the voltage superposition module varies depending on the proportion of charging time to the total charging and discharging time.

[0054] In the second case, firstly, the first selection unit 120 and the first charging circuit control unit 111 are turned on, and the power supply connected to the first power input terminal V1 is for charging the inductor L. Then the energy stored in the inductor L is V10*D.

[0055] Then, the first charging circuit control unit 111 is turned off, and the first selection unit 120 remains on, with the output and input satisfying the following formula:

[0056] VOUT*(1-D)=V10*D+V10(1-D);

[0057] From this, we can conclude that...

[0058] Since D is a value between 0 and 1, the voltage of the inductor superposition module 100 is greater than the first power supply voltage, so only the first power supply voltage can be superimposed.

[0059] Figure 4 The diagram illustrates an inductor superposition module 100 for a panel power supply circuit, including a second inductor L2 connected between a second terminal of a second selection unit 130 and the output terminal Vout of the inductor superposition module 100. (Reference) Figure 4 Optionally, the inductor superposition module 100 includes a second inductor L2 and a second charging circuit control unit 112; the first end of the second inductor L2 is connected to the second end of the first selection unit 120 and the second end of the second selection unit 130, respectively, and the second end of the second inductor L2 is connected to the output terminal of the power supply circuit; the first end of the second charging circuit control unit 112 is electrically connected to the second end of the second inductor L2, and the second end of the second charging circuit control unit 112 is connected to the ground terminal GND. Optionally, the second charging circuit control unit 112 includes a second circuit control switch K4.

[0060] for Figure 4 The working principle of the inductor superposition module 100 of the panel power supply circuit shown, which superimposes at least one of the first power supply voltage and the second power supply voltage, is as follows:

[0061] In the first scenario, firstly, the first selection unit 120 and the second charging circuit control unit 112 are turned on, and the power supplied to the first power input terminal V1 is used to charge the inductor L; then, the first selection unit 120 and the second charging circuit control unit 112 are turned off, and the second selection unit 130 is turned on. The above working process is similar to... Figure 2 and Figure 3 The working process is the same in the first case, and the output voltage of the inductor superposition module 100 is also the same.

[0062] In the second scenario, firstly, the first selection unit 120 and the second charging circuit control unit 112 are turned on, and the power supplied to the first power input terminal V1 charges the inductor L; then, the second charging circuit control unit 112 is turned off, and the first selection unit 120 remains on. The above process is similar to... Figure 2 and Figure 3 The working process is the same in the second case, and the output voltage of the inductor superposition module 100 is also the same.

[0063] In the third case, firstly, the second selection unit 130 and the second charging circuit control unit 112 are turned on, and the power supply connected to the second power input terminal V2 is used to charge the inductor L. Then the energy stored in the inductor L is V2*D.

[0064] Then, the first selection unit 120 and the second charging circuit control unit 112 are turned off, the first selection unit 120 is turned on, and the output and input satisfy the following formula:

[0065] VOUT*(1-D)=V20*D+V10(1-D);

[0066] From this, we can conclude that...

[0067] Where V10 is the first power supply voltage, V20 is the second power supply voltage, D is the proportion of charging time to the total charging and discharging time (therefore, D is a value between 0 and 1), and VOUT is the output voltage of the inductor superposition module 100. As can be seen from the above formula, the voltage output by the inductor superposition module 100 is greater than the first power supply voltage, and the magnitude of the voltage output by the voltage superposition module varies depending on the proportion of charging time to the total charging and discharging time.

[0068] In the second case, firstly, the second selection unit 130 and the second charging circuit control unit 112 are turned on, and the power supply connected to the first power input terminal V1 is used to charge the inductor L. Then the energy stored in the inductor L is V20*D.

[0069] Then, the second charging circuit control unit 112 is turned off, and the second selection unit 130 remains on, with the output and input satisfying the following formula:

[0070] VOUT*(1-D)=V20*D+V20(1-D);

[0071] From this, we can conclude that...

[0072] Since D is a value between 0 and 1, the voltage of the inductor superposition module 100 is greater than the second power supply voltage, so only the second power supply voltage can be superimposed.

[0073] Figure 5The diagram illustrates an inductor superposition module 100 for a panel power supply circuit, comprising a first inductor L1, a first charging circuit control unit 111, a second inductor L2, and a second charging circuit control unit 112. The first inductor L1 is connected between the second terminal of the first selection unit 120 and the second terminal of the second selection unit 130. The first charging circuit control unit 111 is connected in parallel with the second power supply branch 2, and the parallel connection point of the first charging circuit control unit 111 is between the first inductor L1 and the second terminal of the second selection unit 130. The second inductor L2 is connected between the second terminal of the second selection unit 130 and the output terminal Vout of the inductor superposition module 100. The first terminal of the second charging circuit control unit 112 is electrically connected to the second terminal of the second inductor L2, and the second terminal of the second charging circuit control unit 112 is connected to the ground terminal GND.

[0074] about Figure 5 The working principle of the inductor superposition module 100 of the panel power supply circuit shown, which superimposes at least one of the first power supply voltage and the second power supply voltage, is as follows:

[0075] In the first scenario, the first selection unit 120 and the first charging circuit control unit 111 are first turned on, and the power supply connected to the first power input terminal V1 charges the first inductor L1. Then, the first selection unit 120 and the first charging circuit control unit 111 are turned off, and the second selection unit 130 and the second charging circuit control unit 112 are turned on, and the power supply connected to the second power input terminal V2 charges the second inductor L2. Next, the second charging circuit control unit 112 is turned off, and one of the first selection unit 120 and the second selection unit 130 is turned on, realizing the superposition of either the first power supply voltage or the second power supply voltage with the corresponding voltage stored on the first inductor L1 and the corresponding voltage stored on the second inductor L2.

[0076] In the second scenario, the first selection unit 120 and the first charging circuit control unit 111 are turned on, and the power supply connected to the first power input terminal V1 charges the first inductor L1. Then, the first charging circuit control unit 111 is turned off, and one of the first selection unit 120 and the second selection unit 130 is turned on, realizing the superposition of either the first power supply voltage or the second power supply voltage with the corresponding voltage stored on the first inductor L1.

[0077] In the third case, the second selection unit 130 and the second charging circuit control unit 112 are turned on, and the power supply connected to the second power input terminal V2 charges the second inductor L2. Then the second charging circuit control unit 112 is turned off, and one of the first selection unit 120 and the second selection unit 130 is turned on, realizing the superposition of the first power supply voltage or the second power supply voltage with the corresponding voltage stored on the first inductor L1.

[0078] It should be noted that in the above embodiments of the present invention, after charging the first inductor L1 and / or the second inductor L2, one of the first selection unit 120 and the second selection unit 130 is turned on, so that the superposition of one of the first power supply voltage or the second power supply voltage, the voltage stored on the first inductor L1 and / or the voltage stored on the first inductor L1 is based on the premise that the first power supply voltage and the second power supply voltage are not equal. When the first power supply voltage and the second power supply voltage are equal, the first selection unit 120 and the second selection unit 130 can be turned on simultaneously.

[0079] It should also be noted that the various operating states corresponding to the power supply circuits of the aforementioned panels can be controlled by the driver chip. Optionally, the driver chip is electrically connected to the first selection unit 120, the second selection unit 130, the first charging circuit control unit 111, and the second charging circuit control unit 112, thereby controlling the conduction state of the first selection unit 120, the second selection unit 130, the first charging circuit control unit 111, and the second charging circuit control unit 112. Optionally, the driver chip controls the conduction state of the first selection unit 120, the second selection unit 130, the first charging circuit control unit 111, and the second charging circuit control unit 112 according to the power supply voltage required by the display panel. For example, the driver chip controls the first selection unit 120, the second selection unit 130, the first charging circuit control unit 111, and the second charging circuit control unit 112 in an operating state that is greater than the power supply voltage required by the display panel and has the smallest difference from the power supply voltage required by the display panel, thereby reducing power consumption. The above description uses the driver chip to control the first selection unit 120, the second selection unit 130, the first charging circuit control unit 111, and the second charging circuit control unit 112 as an example. If the inductor superposition module 100 does not include one of the first selection unit 120, the second selection unit 130, the first charging circuit control unit 111, or the second charging circuit control unit 112 (for example, it does not include the first charging circuit control unit 111 or the second charging circuit control unit 112), then only the three included ones need to be controlled, and will not be described in detail here.

[0080] Based on the above technical solution, the inductor superposition module is specifically used to output any power supply voltage or the voltage obtained by superimposing at least one power supply voltage through an inductor.

[0081] Specifically, the inductor superposition module can be electrically connected to the driver chip. The driver chip controls the inductor superposition module to output any power supply voltage or a voltage obtained by superimposing at least one power supply voltage through an inductor, based on the voltage required by the display panel. That is, in this embodiment, the inductor superposition module is not only used to output the voltage obtained by superimposing at least one power supply voltage through an inductor, but also to output the power supply voltage corresponding to the power supply voltage input terminal, thereby further expanding the application scenarios of the panel power supply circuit. Furthermore, because the inductor superposition module can output more voltages, it is more beneficial for the driver chip to select the voltage with the smallest difference from the power supply voltage required by the panel, thereby further reducing power consumption.

[0082] To enable the inductor superposition module to output any power supply voltage or at least one power supply voltage superimposed by the inductors, the panel power supply circuit may optionally include a control switch connected in parallel with each inductor. The control switch controls whether the inductor is connected to the panel power supply circuit. For example, for any inductor, when the control switch connected in parallel is closed, the inductor is short-circuited and is not connected to the panel power supply circuit; when the control switch is open, the inductor is normally connected to the panel power supply circuit. By including a control switch in parallel with each inductor in the panel power supply circuit, the inductor superposition module can output more voltages of different magnitudes. This makes it easier for the driver chip to select the voltage with the smallest difference from the required power supply voltage for the panel, further reducing power consumption.

[0083] Combination Figure 2 , Figure 3 and Figure 5 The panel power supply circuit includes a first control switch T1 connected in parallel with the first inductor L1; combined with Figures 4-5 The panel power supply circuit includes a second control switch T2 connected in parallel with the second inductor L2.

[0084] by Figure 5 The following explanation will be based on the power supply circuit of the panel shown.

[0085] The above embodiments have already described the case where the first control switch T1 and the second control switch T2 are not included, which can also be considered as the case where both the first control switch T1 and the second control switch T2 are open, and will not be described again here.

[0086] Figure 5In the panel power supply circuit shown, there are multiple scenarios when either the first control switch T1 or the second control switch T2 can be closed. One scenario will be illustrated as an example. First, the first control switch T1, the first selection unit 120, and the second charging circuit control unit 112 are closed, the first inductor L1 is short-circuited, and the power supply connected to the first power supply voltage input terminal charges the second inductor L2. Then, the first control switch T1 and the second charging circuit control unit 112 are open, the first selection unit 120 and the first charging circuit control unit 111 are closed, and the power supply connected to the first power supply voltage input terminal charges the first inductor L1. Next, when the first power supply voltage and the second power supply voltage are unequal, one of the first selection unit 120 and the second selection unit 130 is closed, and all other switches in the circuit are open, thus achieving the superposition of the first power supply voltage, the voltage stored in the first inductor L1, and the voltage stored in the second inductor L2. Many other scenarios can also exist when either the first control switch T1 or the second control switch T2 can be closed; based on the same concept described above, they will not be described in detail here.

[0087] Figure 5 In the panel power supply circuit shown, when both the first control switch T1 and the second control switch T2 are closed, by controlling one of the first selection unit 120 and the second selection unit 130 to be turned on, all other switches in the circuit are turned off, so that the first power supply voltage and the second power supply voltage can be output.

[0088] Continue to refer to Figures 2-5 Optionally, the inductor superposition module 100 also includes a reverse protection diode D0, which is disposed between the second terminal of the second selection unit 130 and the output terminal Vout of the inductor superposition module 100; thereby, current can flow from the output terminal Vout of the inductor superposition module 100 to the interior of the inductor superposition module 100, ensuring the normal operation of the panel power supply circuit.

[0089] Optionally, the inductor superposition module 100 also includes a voltage-regulating capacitor C0, thereby stabilizing the output voltage of the inductor superposition module 100. Furthermore, the inductor superposition module 100 may also include a filter capacitor, thereby filtering out noise in the output voltage of the inductor superposition module 100.

[0090] The output terminal Vout of the inductor superposition module 100 is connected to the load R0, which can be a display panel.

[0091] Figure 6 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention, for reference. Figure 6Optionally, the panel power supply circuit also includes a voltage regulator module 200 that is connected one-to-one with the output terminal of the inductor superposition module 100. The voltage regulator module 200 is used to process the voltage output from the output terminal of the inductor superposition module 100 into the target voltage.

[0092] Optionally, the voltage regulator module 200 includes a low dropout regulator (LDO). The voltage regulator module 200 is used to process the voltage output from the output terminal of the inductor superposition module 100 into a target voltage. Specifically, the driver chip controls the output terminal of the inductor superposition module 100 to output a voltage to the voltage regulator module 200 that is greater than and closest to the target voltage that the inductor L module can output, and the voltage regulator module 200 processes this voltage into the target voltage output.

[0093] Figure 7 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention, for reference. Figure 7 Optionally, the panel power supply circuit also includes a selection module 300. The input terminal of the selection module 300 is connected to the output terminal of the inductor superposition module 100. The first output terminal of the selection module 300 is electrically connected to the output terminal VO of the panel power supply circuit. The second output terminal of the selection module 300 is electrically connected to the voltage regulator module 200. The selection module 300 is used to directly output the power supply voltage output by the inductor superposition module 100 to the output terminal VO of the panel power supply circuit through the first output terminal when the target voltage is equal to any power supply voltage; and to output the voltage output by the output terminal of the inductor superposition module 100 to the voltage regulator module 300 through the second output terminal when the target voltage is not equal to the power supply voltage, so that the voltage regulator module 300 processes the voltage output by the output terminal of the inductor superposition module 100 into the target voltage.

[0094] Optionally, the selection module 300 includes a first switching unit M1 between its input terminal and the first output terminal, and a second switching unit M2 between its input terminal and the second output terminal. When the target voltage is equal to any power supply voltage, the driver chip can control the first switching unit M1 to turn on and the second switching unit M2 to turn off. When the target voltage is not equal to the power supply voltage, the driver chip can control the first switching unit M1 to turn off and the second switching unit M2 to turn on.

[0095] The target voltage can be either a first voltage required by the display panel or a second voltage required by the display panel. The display panel includes pixel circuitry. Figure 8This is a schematic diagram of a pixel circuit in the prior art, wherein a first voltage is provided to a first voltage input terminal VDD, and a second voltage is provided to a second voltage input terminal VSS. Because the first voltage and the second voltage required by the pixel circuit may differ depending on the display mode or display screen, the panel power supply circuit of this invention can achieve the output of the target voltage required by the panel, which helps to reduce power consumption and improve display performance.

[0096] Figure 9 This is a schematic diagram of a voltage regulator module provided in an embodiment of the present invention, for reference. Figure 9 Optionally, the voltage regulator module includes a switching unit 210, an amplifier circuit 220, and a feedback circuit 230. The amplifier circuit 220 includes an operational amplifier 221 and a voltage divider circuit 222. Specifically, the non-inverting input of the operational amplifier 221 can be connected to the output of the voltage divider circuit 222. The voltage divider circuit 222 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 can be connected to a fixed voltage V0. The second end of the first resistor R1 is electrically connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the output of the feedback circuit 230. The common terminal of the first resistor R1 and the second resistor R2 serves as the output of the voltage divider circuit 222. The inverting input of the operational amplifier 221 is connected to a fixed reference voltage Vref. The switching unit 210 may include a MOSFET. The gate of the MOSFET is connected to the output of the operational amplifier 221. The source (IN) of the MOSFET serves as the input and can be connected to the output of the corresponding inductor superposition module. The drain (OUT) of the MOSFET serves as the output and is connected to the input of the feedback circuit 230. The output of the feedback circuit 230 is connected to the second terminal of the second resistor R2. When the output voltage of the MOSFET drops due to load changes or other reasons, the voltage across the two series voltage divider resistors also drops, resulting in a decrease in the voltage input to the non-inverting input of the operational amplifier 221. Since the reference voltage Vref at the inverting input of the operational amplifier 221 remains unchanged, the operational amplifier 221 reduces its output, causing the gate potential of the MOSFET to decrease. The voltage at the source input of the MOSFET remains unchanged, thus increasing the absolute value of the gate-source voltage difference, |Vgs|. The MOSFET operates in the saturation region, and the output current flowing through the MOSFET increases. This increased output current causes the potential at the drain output of the MOSFET to rise, completing a feedback control cycle. This returns the drain output of the MOSFET to its normal potential, thereby achieving the voltage regulation function of the voltage regulator module.

[0097] Figure 10 This is a schematic diagram of another panel power supply circuit provided in an embodiment of the present invention, for reference. Figure 10The panel power supply circuit includes a first inductor superposition module 101 and a second inductor superposition module 102. The output terminal of one of the first inductor superposition module 101 and the second inductor superposition module 102 is connected to a voltage inversion module 400. The voltage inversion module 400 is used to convert the input voltage into a voltage of opposite polarity.

[0098] Combination Figure 10 Specifically, in the pixel circuit of the existing display panel, the first voltage input terminal VDD requires a positive voltage, and the second voltage input terminal VSS requires a negative voltage. Therefore, in this embodiment, a voltage inversion module 400 is connected to the output terminal of one of the first inductor superposition module 101 and the second inductor superposition module 102. The voltage inversion module 400 converts the input voltage into a voltage of opposite polarity, thereby meeting the voltage requirements of the pixel circuit.

[0099] This invention also provides a driver chip, which includes a panel power supply circuit according to any of the above embodiments of this invention, wherein the output terminal of the panel power supply circuit is electrically connected to the power output terminal of the driver chip, thereby providing panel power through the internal power supply of the driver chip.

[0100] This invention also provides a display device, characterized in that it includes a driver chip as described in the above embodiments of this invention, and further includes a display panel, the display panel being electrically connected to the power output terminal of the driver chip, and the driver chip being used to control the voltage output to the power output terminal according to the voltage of the control voltage superposition module.

[0101] The power output terminal of the driver chip includes a first power output terminal and a second power output terminal. The first power output terminal is used to output a first voltage to the first voltage input terminal of the pixel circuit, and the second power output terminal is used to input a second voltage to the second voltage input terminal of the pixel circuit.

[0102] The driver chip is used to control the voltage output to the power output terminal by the voltage superposition module. Specifically, the driver chip can output a voltage that is greater than the target voltage and has the smallest difference from the target voltage according to the target voltage required by the display panel, thereby reducing the power consumption of the display panel.

[0103] This invention also provides a panel power supply system. Figure 11 This is a schematic diagram of the panel power supply system provided in an embodiment of the present invention, for reference. Figure 11The panel power supply system of this invention includes a driver chip in the above embodiment, the output terminal of which is connected to the display panel; it also includes a battery 10 and a power chip 20, wherein the output terminal of the battery 10 is electrically connected to the input terminal of the power chip 20, and the output terminal of the power chip 20 is electrically connected to the input terminal of the driver chip 30. The power chip 20 is used to provide a first power voltage to the first power input terminal of the panel power supply circuit in the driver chip 30, and to provide a second power voltage to the second power input terminal of the panel power supply circuit. Because the driving capability of the panel power supply architecture provided by the internal power supply of the driver chip 30 in the prior art is limited, existing panel power supply systems require two power chips 20 to ensure the normal supply of the first and second voltages to the display panel. The panel power supply system of this embodiment only requires one power chip 20 to achieve the normal supply of the first and second voltages to the display panel, simplifying the structure of the panel power supply system and reducing its cost.

[0104] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A panel power supply circuit, characterized in that, Includes at least two power input terminals, a ground terminal, and at least one inductor superposition module; The inductor superposition module is electrically connected to each of the power input terminals and the ground terminal respectively. The inductor superposition module includes at least one inductor, which is used to store the power supply voltage corresponding to at least one of the power input terminals and the ground terminal. The inductor superposition module is used to output the voltage after superimposing at least one of the power supply voltages through the inductor. The panel power supply circuit includes the inductor superposition module, which uses the inductor included in the inductor superposition module to achieve voltage boost. When the inductor is charged, the power input terminal, the inductor and the ground terminal form a charging circuit. Current flows through the inductor, and the inductor converts electrical energy into magnetic energy for storage. When the charging circuit is disconnected to supply power to the load, the magnetic energy in the inductor is converted into electrical energy at the inductor terminal. The voltage of the inductor is superimposed on the power input terminal, and the voltage of the inductor and the voltage input at the power input terminal will generate a higher voltage. Moreover, the voltage boost is achieved by using inductors, so that the energy supply to the load in the display panel is uninterrupted, thereby avoiding the problem of limited driving capability of the driver chip caused by the charging and discharging voltage boost of the capacitor in the charge pump, and improving the driving capability of the driver chip.

2. The panel power supply circuit according to claim 1, characterized in that, The at least two power input terminals include a first power input terminal and a second power input terminal, and the inductor superposition module further includes at least one charging circuit control unit, a first selection unit, and a second selection unit; Wherein, the first end of the first selection unit is connected to the first power input terminal, and the first end of the second selection unit is connected to the second power input terminal; the grounding terminal and the second end of the first selection unit form a first power supply branch, and the grounding terminal and the second end of the second selection unit form a second power supply branch; The inductor is connected between the second end of the first selection unit and the second end of the second selection unit, and / or one of the inductors is connected between the second end of the second selection unit and the output end of the inductor superposition module; The charging circuit control unit is used to control the charging state of the first power supply branch to the corresponding inductor when the first selection unit is turned on; or the charging circuit control unit is used to control the charging state of the second power supply branch to the corresponding inductor when the second selection unit is turned on.

3. The panel power supply circuit according to claim 2, characterized in that, The inductor superposition module includes a first inductor and a first charging circuit control unit; a first end of the first inductor is connected to a second end of the first selection unit, and a second end of the first inductor is connected to a second end of the second selection unit; a second end of the second selection unit is connected to the output end of the inductor superposition module. The first charging circuit control unit is connected in parallel with the second power supply branch.

4. The panel power supply circuit according to claim 2 or 3, characterized in that, The inductor superposition module includes a second inductor and a second charging circuit control unit; the first end of the second inductor is connected to the second end of the first selection unit and the second end of the second selection unit respectively, and the second end of the second inductor is connected to the output end of the power supply circuit. The first terminal of the second charging circuit control unit is electrically connected to the second terminal of the second inductor, and the second terminal of the second charging circuit control unit is connected to the ground terminal.

5. The panel power supply circuit according to claim 2, characterized in that, The inductor superposition module also includes a reverse protection diode, which is disposed between the second terminal of the second selection unit and the output terminal of the inductor superposition module.

6. The panel power supply circuit according to claim 1, characterized in that, The inductor superposition module is specifically used to output any of the power supply voltages or at least one of the power supply voltages superimposed by the inductor.

7. The panel power supply circuit according to claim 6, characterized in that, The panel power supply circuit also includes control switches that are connected in parallel with the inductors in a one-to-one correspondence.

8. The panel power supply circuit according to claim 1, characterized in that, It also includes a voltage regulator module that is connected one-to-one with the output terminal of the inductor superposition module. The voltage regulator module is used to process the voltage output from the output terminal of the inductor superposition module into the target voltage.

9. The panel power supply circuit according to claim 8, characterized in that, The panel power supply circuit also includes a selection module. The input terminal of the selection module is connected to the output terminal of the inductor superposition module. The first output terminal of the selection module is electrically connected to the output terminal of the panel power supply circuit. The second output terminal of the selection module is electrically connected to the voltage regulator module. The selection module is used to output the power supply voltage output by the inductor superposition module directly to the output terminal of the panel power supply circuit through the first output terminal when the target voltage is equal to any of the power supply voltages. And when the target voltage is not equal to the power supply voltage, the voltage output from the output terminal of the inductor superposition module is output to the voltage regulator module through the second output terminal.

10. The panel power supply circuit according to claim 1, characterized in that, The inductor superposition module includes a first inductor superposition module and a second inductor superposition module, wherein the output terminal of one of the first inductor superposition module and the second inductor superposition module is connected to a voltage inversion module, which is used to convert the input voltage into a voltage of opposite polarity.

11. A driver chip, characterized in that, The panel power supply circuit includes any one of claims 1-10, wherein the output terminal of the panel power supply circuit is electrically connected to the power output terminal of the driver chip.

12. A display device, characterized in that, The device includes the driver chip of claim 11, and further includes a display panel, the display panel being electrically connected to the power output terminal of the driver chip, the driver chip being used to control the voltage output to the power output terminal by the voltage superposition module.

13. A panel power supply system, characterized in that, The device includes the driver chip of claim 11, and further includes a battery and a power chip, wherein the output terminal of the battery is electrically connected to the input terminal of the power chip, the output terminal of the power chip is electrically connected to the input terminal of the driver chip, and the power chip is used to provide a first power supply voltage to the first power input terminal of the panel power supply circuit in the driver chip, and to provide a second power supply voltage to the second power input terminal of the panel power supply circuit.

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