Display panel, power management method and display device

Abstract

The present disclosure relates to the technical field of display, and provides a display panel, a power management method and a display device. The display panel comprises: a power driving circuit comprising a plurality of voltage stabilizing modules, the voltage stabilizing modules being configured to provide a second digital power voltage to a digital power terminal; a power management circuit configured to provide a first digital power voltage to the digital power terminal or a power supply voltage to the voltage stabilizing modules; wherein the digital power terminal is configured to provide a driving voltage for the display panel. The power circuit provided by the present disclosure can flexibly adjust the working mode of the voltage stabilizing modules in the power management circuit and the power driving circuit according to the rated working voltage range of the digital power terminal in the display panel, so that the voltage signal provided to the digital power terminal will not exceed the rated working voltage range, thereby avoiding display abnormalities caused by changes in line load, and ensuring normal display of the display panel.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, in particular to a display panel, a power management method and a display device. BACKGROUND

[0002] AMOLED (Active-matrix organic light-emitting diode) has gradually occupied a dominant position in the fields of NB, Tablet, Mobile and Wearable due to its ultra-high display contrast, ultra-realistic color display effect and ultra-high screen ratio.

[0003] In traditional AMOLED display, the DVDD voltage is supplied from the outside of PMIC to DDIC (Display Driver IC). The traditional hybrid-DVDD technical solution is that the DVDD voltage output by PMIC is connected together with the DVDD voltage generated by the internal LDO of DDIC to provide internal digital voltage for DDIC. The traditional hybrid-DVDD circuit cannot meet the current demand.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present disclosure is to overcome the deficiencies of the prior art, and to provide a display panel, a power management method and a display device.

[0006] According to one aspect of the present disclosure, a display panel is provided, comprising: a power supply driving circuit comprising a plurality of voltage stabilizing modules, the voltage stabilizing modules being configured to provide a second digital power supply voltage to a digital power supply end; a power management circuit configured to provide a first digital power supply voltage to the digital power supply end or a power supply voltage to the voltage stabilizing modules; wherein the digital power supply end is configured to provide a driving voltage for the display panel.

[0007] In the example embodiment of the present disclosure, the power supply voltage includes a first power supply voltage and a second power supply voltage; the power supply driving circuit includes: a first voltage stabilizing module, a power input end of which is connected to a first power supply voltage end, a reference voltage end of which is connected to a first reference voltage end, and a feedback voltage end of which is connected to a voltage output end, the first voltage stabilizing module being configured to output the second digital power supply voltage after step-down of the first power supply voltage output by the first power supply voltage end; and a second voltage stabilizing module, a power input end of which is connected to a second power supply voltage end, a reference voltage end of which is connected to a second reference voltage end, and a feedback voltage end of which is connected to the voltage output end, the second voltage stabilizing module being configured to output the second digital power supply voltage after step-down of the second power supply voltage output by the second power supply voltage end.

[0008] In the example embodiment of the present disclosure, the display panel further includes: a first switch, a fixed end of which is connected to a voltage output end of the power management circuit, and a movable end of which is configured to be connected to the second power supply voltage end or a digital power supply switching end; a second switch, which is connected between the first power supply voltage end and the second power supply voltage end; and a third switch, a fixed end of which is connected to the digital power supply end, and a movable end of which is configured to be connected to the digital power supply switching end or a voltage output end of the second voltage stabilizing module.

[0009] In the example embodiment of the present disclosure, the movable end of the first switch is connected to the digital power supply switching end, the second switch is closed, and the movable end of the third switch is connected to the digital power supply switching end; wherein the first voltage stabilizing module is configured to output the second digital power supply voltage and the second voltage stabilizing module is closed; and the power management circuit is configured to output the first digital power supply voltage.

[0010] In the example embodiment of the present disclosure, the movable end of the first switch is connected to the second power supply voltage end, the second switch is open, and the movable end of the third switch is connected to the voltage output end of the second voltage stabilizing module; wherein the second voltage stabilizing module is configured to output the second digital power supply voltage and the first voltage stabilizing module is closed; and the power management circuit is configured to output the second power supply voltage.

[0011] In the example embodiment of the present disclosure, the movable end of the first switch is connected to the second power supply voltage end, the second switch is closed, and the movable end of the third switch is connected to the digital power supply switching end; wherein the first voltage stabilizing module is configured to output the second digital power supply voltage and the second voltage stabilizing module is closed; and the power management circuit is further configured to output the second power supply voltage.

[0012] In the example embodiment of the present disclosure, the first power supply voltage is greater than the second power supply voltage.

[0013] In the exemplary embodiments of the present disclosure, the display panel further comprises a filter capacitor, a first end of the filter capacitor being connected to the digital power adapter end, and a second end of the filter capacitor being grounded.

[0014] In the exemplary embodiments of the present disclosure, the display panel further comprises a first circuit board, a second circuit board and a third circuit board; the power management circuit is located on the first circuit board, the power drive circuit is located on the second circuit board, the third circuit board is connected between the first circuit board and the second circuit board, and the equivalent resistance of the first circuit board is greater than the equivalent resistance of the second circuit board and the third circuit board.

[0015] In the exemplary embodiments of the present disclosure, the display panel further comprises a display drive circuit, the display drive circuit comprising the power drive circuit and the digital power end.

[0016] According to the second aspect of the present disclosure, a display panel power management method is further provided, applied to the display panel of any of the embodiments of the present disclosure, the method comprising: providing a second digital power voltage to the digital power end by a voltage stabilizing module in the power drive circuit; and providing a first digital power voltage to the digital power end or providing a power supply voltage to the voltage stabilizing module by the power management circuit.

[0017] In the exemplary embodiments of the present disclosure, the method comprises: controlling the first switch to connect the voltage output end of the power management circuit and the digital power adapter end, controlling the second switch to connect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power end and the voltage output end of the second voltage stabilizing module; and controlling the power management circuit to provide the second power supply voltage to the second voltage stabilizing module in the power drive circuit, and controlling the second voltage stabilizing module to output the second digital power voltage to the digital power end in response to the second power supply voltage.

[0018] In the exemplary embodiments of the present disclosure, the method comprises: controlling the first switch to connect the voltage output end of the power management circuit and the second power supply voltage end, controlling the second switch to disconnect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power end and the voltage output end of the second voltage stabilizing module; and controlling the power management circuit to provide the second power supply voltage to the second voltage stabilizing module in the power drive circuit, and controlling the second voltage stabilizing module to output the second digital power voltage to the digital power end in response to the second power supply voltage.

[0019] In an exemplary embodiment of this disclosure, the method includes: controlling a first switch to connect to the voltage output terminal and the second supply voltage terminal of a power management circuit; controlling a second switch to connect to the first supply voltage terminal and the second supply voltage terminal; and controlling a third switch to connect to a digital power terminal and a digital power adapter terminal; controlling the power management circuit to provide the first supply voltage to a first voltage regulator module in the power drive circuit, wherein the first voltage regulator module outputs the second digital power voltage to the digital power terminal in response to the first supply voltage.

[0020] According to a third aspect of this disclosure, a display device is also provided, including the display panel described in any embodiment of this disclosure.

[0021] The power supply circuit provided in this disclosure includes a power drive circuit comprising multiple voltage regulator modules. A second digital power supply voltage can be output to the digital power supply terminal of the power drive circuit via any of the voltage regulator modules. Simultaneously, the power management circuit can also output a first digital power supply voltage to the digital power supply circuit or a supply voltage to the power drive circuit. This allows for flexible adjustment of the operating modes of the voltage regulator modules in the power management circuit and the power drive circuit according to the rated operating voltage range of the digital power supply terminal in the display panel. This ensures that the voltage signal supplied to the digital power supply terminal does not exceed its rated operating voltage range, thereby preventing display abnormalities caused by changes in line load and guaranteeing normal display of the display panel.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0024] Figure 1 This is a schematic diagram of the power supply circuit according to one embodiment of the present disclosure;

[0025] Figure 2 A schematic diagram of the power supply circuit according to another embodiment of this disclosure;

[0026] Figure 3 This is a schematic diagram of the power supply circuit connection under one operating mode according to the present disclosure;

[0027] Figure 4 This is a schematic diagram of the power supply circuit connection under one operating mode according to the present disclosure;

[0028] Figure 5 Connection diagram of power supply circuit according to another working mode of the present disclosure;

[0029] Figure 6 Flow chart of display panel power management method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the specification. It will be understood that, although the terms first, second, third etc. can be used herein to describe various elements / regions, these elements / regions should not be limited by these terms since such elements / regions can be labeled in another suitable manner.

[0031] Although relative terms such as "upper", "lower", etc. are used herein to describe one component's relationship to another component in the drawings, such terms are used only for convenience and are not to be construed as limiting the scope of the disclosure. It is to be understood that if a device is flipped over, so that the upper portion is now the lower portion, the described component is now the component that was previously described as being "below". When a structure is "on" another structure, it can mean that the structure is formed integrally with the other structure or that the structure is "directly" on the other structure or that the structure is "indirectly" on the other structure via another structure.

[0032] The terms "one", "a", "an", "the", and "at least one" are used to mean that "one or more" of something is present; the terms "comprising", "having", and "including" are used to mean "including, but not limited to"; the term "first", "second", and "third" are used only as labels, and are not meant to limit the quantity of such elements; and the term "plurality" is used to mean "two or more".

[0033] In the related art, in AMOLED display, the DVDD voltage is supplied from the PMIC to the DDIC (Display Driver IC). The traditional hybrid-DVDD technical solution is that the DVDD voltage output by the PMIC is connected with the DVDD voltage generated by the internal LDO of the DDIC to provide internal digital voltage for the DDIC. Since the DDIC is updated and iterated at a relatively high speed, the 40 nm process is gradually replaced by the 28 nm process or even the 22 nm process, accordingly, the DVDD voltage is reduced from the previous typical 1.2 V to typical 1.0 V (the voltage bearing range is 0.9-1.1 V) or even lower. The I R Drop generated by the line resistance is increasingly large to the fluctuation of the DVDD voltage, and therefore, it is more important to evaluate the stable output of the DVDD voltage.

[0034] The voltage and current of the DVDD voltage change in a wide range with the complexity of the screen display picture. For example, the panel originally displays normally under a color complex picture, the DVDD current is about 50 mA, and the voltage at the DDIC end is about 1.05 V, which can meet the normal display. However, if the panel picture is switched to a white low gray scale picture (for example, Gray64) with light load, the I R Drop generated by the line impedance is reduced, the voltage output to the DDIC end is increased to 1.15 V, which exceeds the bearing range of the DDIC DVDD (the bearing range of the DVDD voltage is 0.9-1.1 V), and the DDIC is shut down, which causes the abnormal display of the AMOLED screen.

[0035] To solve the above problems, the present disclosure provides a novel display panel power supply circuit, which has multiple working modes and can provide digital power supply voltage for a digital power supply end with different rated working voltage. Figure 1 As shown in FIG. 1, the power supply circuit according to an embodiment of the present disclosure can be used to provide a voltage signal for a digital power supply end DVDD of a display panel, so that the digital power supply end DVDD outputs a driving voltage to drive the display panel to display. Figure 1 As shown in FIG. 2, the power supply circuit can include a power management circuit 100 and a power supply driving circuit 200, wherein the power supply driving circuit 200 includes a plurality of voltage stabilizing modules, the voltage stabilizing modules are used to provide a second digital power supply voltage DVDD2 for the digital power supply end DVDD; the power management circuit 100 is used to provide a first digital power supply voltage DVDD1 for the digital power supply end DVDD or a power supply voltage VDD for the voltage stabilizing modules; and the digital power supply end DVDD is used to provide a driving voltage for the display panel. Figure 1

[0036] ​The power supply circuit provided by the present disclosure, the power supply driving circuit 200 includes multiple voltage stabilizing modules, and the second digital power supply voltage DVDD2 can be output to the digital power supply end DVDD of the power supply driving circuit 200 through any voltage stabilizing module, meanwhile, the power management circuit 100 can also output the first digital power supply voltage DVDD1 to the digital power supply circuit or can output the power supply voltage VDD to the power supply driving circuit 200, so that the working mode of the voltage stabilizing module in the power management circuit 100 and the power supply driving circuit 200 can be flexibly adjusted according to the rated working voltage range of the digital power supply end DVDD in the display panel, so that the voltage signal provided to the digital power supply end DVDD will not exceed the rated working voltage range, thereby avoiding the display abnormality caused by the change of the line load, so as to ensure the normal display of the display panel.

[0037] In the example embodiment, the display panel can further include a digital circuit, the digital circuit can be connected with the digital power supply end DVDD to provide the digital voltage for the digital circuit. The digital power supply end DVDD is connected with each signal line on the display panel through the digital circuit, so as to drive the digital circuit to provide the logic level signal (including the high level signal and the low level signal) for each signal line of the display panel, and drive the display panel to emit light.

[0038] Figure 2 The structure schematic diagram of the power supply circuit according to another embodiment of the present disclosure is shown in FIG. 2, in the example embodiment, the display panel can further include a display driving circuit DDIC, the power supply driving circuit 200 can be the internal circuit of the display driving circuit DDIC, and the digital power supply end DVDD can be a pin of the display driving circuit DDIC. The power management circuit 100 can be an integrated circuit, that is, the power management circuit 100 can be a PMIC (Power Management IC). Figure 2 As shown in FIG. 3, the display panel can include a first circuit board, a second circuit board and a third circuit board, the first circuit board can be a PCB (printed circuit board) for example, the second circuit board can be a COF (chip on film) for example, and the third circuit board can be a FPC (flexible printed circuit) for example. The power management circuit 100 is located on the PCB, the power supply driving circuit 200 is located on the COF, for example, the PMIC is located on the PCB, the DDIC is integrated on the COF, and the FPC is connected between the PCB and the COF.

[0039] Figure 2 As shown in FIG. 3, the display panel can include a first circuit board, a second circuit board and a third circuit board, the first circuit board can be a PCB (printed circuit board) for example, the second circuit board can be a COF (chip on film) for example, and the third circuit board can be a FPC (flexible printed circuit) for example. The power management circuit 100 is located on the PCB, the power supply driving circuit 200 is located on the COF, for example, the PMIC is located on the PCB, the DDIC is integrated on the COF, and the FPC is connected between the PCB and the COF.

[0040] As shown in FIG. 3, the display panel can include a first circuit board, a second circuit board and a third circuit board, the first circuit board can be a PCB (printed circuit board) for example, the second circuit board can be a COF (chip on film) for example, and the third circuit board can be a FPC (flexible printed circuit) for example. The power management circuit 100 is located on the PCB, the power supply driving circuit 200 is located on the COF, for example, the PMIC is located on the PCB, the DDIC is integrated on the COF, and the FPC is connected between the PCB and the COF. Figure 1 , Figure 2 ​As shown, in the exemplary embodiment, the supply voltage VDD can include a first supply voltage VDD1 and a second supply voltage VDD2. The power supply driving circuit 200 can include a first voltage stabilizing module 201 and a second voltage stabilizing module 202, a power input end of the first voltage stabilizing module 201 is connected to the first supply voltage end VDDIO, a reference voltage end of the first voltage stabilizing module 201 is connected to the first reference voltage end VREF1, a feedback voltage end of the first voltage stabilizing module 201 is connected to a voltage output end of the first voltage stabilizing module 201, and the first voltage stabilizing module 201 can be used to output the second digital power supply voltage DVDD2 after voltage reduction of the first supply voltage VDD1 output by the first supply voltage end VDDIO; a power input end of the second voltage stabilizing module 202 is connected to the second supply voltage end DVDDP, a reference voltage end VREF of the second voltage stabilizing module 202 is connected to the second reference voltage end VREF2, a feedback voltage end of the second voltage stabilizing module 202 is connected to a voltage output end of the second voltage stabilizing module 202, and the second voltage stabilizing module 202 can be used to output the second digital power supply voltage DVDD2 after voltage reduction of the second supply voltage VDD2 output by the second supply voltage end DVDDP. The power supply driving circuit 200 of the present disclosure can output the second digital power supply voltage DVDD2 to the digital power supply end DVDD through the first voltage stabilizing module 201 or through the second voltage stabilizing module 202.

[0041] As Figure 1 、 Figure 2As shown, in exemplary embodiments, the first voltage stabilizing module 201 and the second voltage stabilizing module 202 can be low dropout regulators (LDOs). The LDO can compare the voltage of the digital power supply end DVDD with the reference voltage of the reference voltage end through an internal error amplifier. When the voltage of the digital power supply end DVDD is less than or equal to the reference voltage, the LDO can be in a normal working state, and the LDO can provide the second digital power supply voltage DVDD2 to the digital power supply end DVDD after stepping down the power supply input end voltage VDD. When the voltage of the digital power supply end DVDD is greater than the reference voltage, the LDO can be in a high resistance state, i.e., the LDO is in a stop working state, and no longer supplies power to the digital power supply end DVDD. For example, for the first voltage stabilizing module 201, if the output voltage of the first voltage stabilizing module 201 is less than or equal to the voltage of the first reference voltage end VREF1, the LDO in the first voltage stabilizing module 201 can output the second digital power supply voltage DVDD2 to the digital power supply end DVDD after stepping down the first power supply voltage VDD1. If the output voltage of the first voltage stabilizing module 201 is greater than the voltage of the first reference voltage end VREF1, the LDO in the first voltage stabilizing module 201 stops working and no longer outputs the digital power supply voltage to the digital power supply end DVDD. Of course, in other embodiments, the first voltage stabilizing module 201 and the second voltage stabilizing module 202 can also use other circuit structures to implement, and the present disclosure is not limited thereto.

[0042] In exemplary embodiments, the first power supply voltage VDD1 provided to the first voltage stabilizing module 201 can be greater than the second power supply voltage VDD2 provided to the second voltage stabilizing module 202. For example, the first power supply voltage VDD1 can be 1.8V, and the second power supply voltage VDD2 can be 1.3V. For a display driving circuit DDIC with a 28nm process, the rated voltage of the digital power supply end DVDD can be 1.0V. When the first voltage stabilizing module 201 is in a normal working state, the first power supply voltage VDD1 of 1.8V can be stepped down to 1.0V and output to the digital power supply end DVDD, wherein the voltage difference of 0.8V is consumed by the first voltage stabilizing module 201. When the second voltage stabilizing module 202 is in a normal working state, the second power supply voltage VDD2 of 1.3V can be stepped down to 1.0V and output to the digital power supply end DVDD, wherein the voltage difference of 0.3V is consumed by the second voltage stabilizing module 202. It can be seen that the first power supply voltage VDD1 is greater than the second power supply voltage VDD2, and the power consumption of the first voltage stabilizing module 201 is greater than the power consumption of the second voltage stabilizing module 202.

[0043] In addition, as Figure 1 , Figure 2As shown, in the exemplary embodiment, the display panel can further include a first switch S1, a second switch S2 and a third switch S3. The fixed end of the first switch S1 can be connected to the voltage output end of the power management circuit 100, and the active end of the first switch S1 can be used to connect the second power supply voltage end DVDDP or the digital power supply transfer end DVDDT, that is, the output of the power management circuit 100 can be controlled through the first switch S1. When the active end of the first switch S1 is connected to the digital power supply transfer end DVDDT, the output end of the power management circuit 100 is connected to the digital power supply transfer end DVDDT through the first switch S1, and the first power management circuit 100 can be used to output the first digital power supply voltage DVDD1 to the digital power supply end DVDD. When the active end of the first switch S1 is connected to the second power supply voltage end DVDDP, the output end of the power management circuit 100 is connected to the second power supply voltage end DVDDP through the first switch S1, and the power management circuit 100 can output the second power supply voltage VDD2 to the second power supply voltage end DVDDP.

[0044] The second switch S2 is connected between the first power supply voltage end VDDIO and the second power supply voltage end DVDDP, that is, the second switch S2 can switch the first power supply voltage end VDDIO and the second power supply voltage end DVDDP. When the second switch S2 is closed, the second power supply voltage end DVDDP is connected to the first power supply voltage end VDDIO, and the power management circuit 100 can output the first power supply voltage VDD1 to the first power supply voltage end VDDIO through the second power supply voltage end DVDDP. Or, when the second switch S2 is open, the second power supply voltage end DVDDP is disconnected from the first power supply voltage end VDDIO, and the power management circuit 100 can output the second power supply voltage VDD2 to the second power supply voltage end DVDDP.

[0045] The fixed end of the third switch S3 is connected to the digital power supply end DVDD, and the active end of the third switch S3 is used to connect the digital power supply transfer end DVDDT or the voltage output end of the second voltage stabilizing module 202. That is, the output of the second voltage stabilizing module 202 can be controlled through the third switch S3. When the active end of the third switch S3 is connected to the voltage output end of the second voltage stabilizing module 202, the second voltage stabilizing module 202 can output the second digital power supply voltage DVDD2 to the digital power supply end DVDD. When the active end of the third switch S3 is connected to the digital power supply transfer end DVDDT, the second voltage stabilizing module 202 stops working.

[0046] As Figure 2As shown, between the power management circuit 100 and the digital power supply end DVDD, there are the line impedance R1 of the PCB and the line impedance R2 of the FPC. In the case that the first digital power supply voltage DVDD1 is provided to the digital power supply end DVDD through the power management circuit 100, if the load current of the display panel changes, the resistance voltage drop (IR Drop) generated by the line impedance between the power management circuit 100 and the digital power supply end DVDD changes accordingly, and then the voltage transmitted to the digital power supply end DVDD fluctuates. The power supply circuit provided by the present disclosure can work in different working modes to adapt to different rated working voltages of the digital power supply end DVDD in different process procedures. The different working modes of the power supply circuit will be further introduced below in combination with the drawings.

[0047] Figure 3 For the connection schematic diagram of the power supply circuit in one working mode according to the present disclosure, as shown in Figure 3 In this exemplary embodiment, the active end of the first switch S1 is connected to the second power supply voltage end DVDDP, the second switch S2 is closed, and the active end of the third switch S3 is connected to the digital power supply switching end DVDDT; wherein the first voltage stabilizing module 201 is used to output the second digital power supply voltage DVDD2 and the second voltage stabilizing module 202 is closed; and the power management circuit 100 is further used to output the second power supply voltage VDD2.

[0048] In this mode, the power management circuit 100 no longer provides the first digital power supply voltage DVDD1 to the digital power supply end DVDD, but only provides the first power supply voltage VDD1 to the first voltage stabilizing module 201, and the first power supply voltage VDD1 can be 1.1-1.95V, for example, 1.8V. The first voltage stabilizing module 201 outputs the second digital power supply voltage DVDD2 after step-down of the first power supply voltage VDD1 to the digital power supply end DVDD.

[0049] In this mode, because the power management circuit 100 does not supply the first digital power supply voltage DVDD1 to the digital power supply terminal DVDD, there is no resistance voltage drop (IR Drop) caused by the line impedance on the PCB and FPC when the load current of the display panel changes. The first voltage regulator module 201 can then provide a stable second digital power supply voltage DVDD2 to the digital power supply terminal DVDD. That is, the power supply voltage provided by the power circuit to the digital power supply terminal DVDD in this operating mode will not exceed the rated operating voltage range of the digital power supply terminal DVDD due to the IR Drop. Therefore, this connection structure of the power circuit can be used to provide digital power supply voltages to digital power supply terminals DVDD with different rated operating voltages, ensuring that the digital power supply terminal DVDD can work normally and drive the display panel for normal display. For example, for a 40nm process display driver circuit DDIC, or a 28nm process display driver circuit DDIC, or a 20nm process display driver circuit DDIC, all can be... Figure 3 The power supply circuit shown in the diagram provides digital power voltage to the corresponding digital power supply terminal, DVDD.

[0050] Figure 4 This is a schematic diagram of the power supply circuit connection under one operating mode according to the present disclosure, as shown below. Figure 4 As shown, in this exemplary embodiment, the active end of the first switch S1 is connected to the second power supply voltage terminal DVDDP, the second switch S2 is open, and the active end of the third switch S3 is connected to the voltage output terminal of the second voltage regulator module 202; wherein, the second voltage regulator module 202 is used to output the second digital power supply voltage DVDD2 and the first voltage regulator module 201 is turned off; the power management circuit 100 is used to output the second power supply voltage VDD2.

[0051] In this mode, the power management circuit 100 does not supply the first digital power supply voltage DVDD1 to the digital power supply terminal DVDD, but only outputs the second power supply voltage VDD2 to the second voltage regulator module 202 in the power drive circuit 200. Driven by the second power supply voltage VDD2, the second voltage regulator module 202 outputs the second digital power supply voltage DVDD2 to the digital power supply terminal DVDD. The second power supply voltage VDD2 can be 1.2 to 1.95V, for example, it can be 1.4V.

[0052] In this module, because the power management circuit 100 no longer supplies digital power voltage to the digital power supply terminal DVDD, when the load current of the display panel changes, there is no IR drop (resistive voltage drop) caused by the line impedance on the PCB and FPC for the digital power supply terminal DVDD. The second voltage regulator module 202 can provide a stable second digital power voltage DVDD2 to the digital power supply terminal DVDD. That is, the power voltage supplied by the power circuit to the digital power supply terminal DVDD in this operating mode will not exceed the rated operating voltage range of the digital power supply terminal DVDD due to the IR drop. Therefore, this connection structure of the power circuit can also be applied to provide digital power voltage to digital power supply terminals DVDD with different rated operating voltages, ensuring that the digital power supply terminal DVDD can work normally and drive the display panel for normal display. For example, for a 40nm process display driver circuit DDIC, or a 28nm process display driver circuit DDIC, or a 20nm process display driver circuit DDIC, all can be... Figure 4 The power supply circuit shown provides digital power voltage to the corresponding digital power supply terminal, DVDD, in this operating mode. Furthermore, because the second supply voltage VDD2 is lower than the first supply voltage VDD1, the power consumption of the power supply circuit in this operating mode is less than... Figure 3 The power consumption of the power supply circuit in the operating mode shown.

[0053] Figure 5 This is a schematic diagram of the power supply circuit connection according to another operating mode of this disclosure, as shown below. Figure 5 As shown, in this exemplary embodiment, the active end of the first switch S1 is connected to the digital power adapter terminal DVDDT, the second switch S2 is closed, and the active end of the third switch S3 is connected to the digital power adapter terminal DVDDT; wherein, the first voltage regulator module 201 is used to output the second digital power voltage DVDD2 and the second voltage regulator module 202 is turned off; the power management circuit 100 is used to output the first digital power voltage DVDD1.

[0054] In this mode, both the power management circuit 100 and the first voltage regulator module 201 can provide digital power voltage to the digital power supply terminal of the DVDD. Therefore, the power management circuit 100 and the first voltage regulator module 201 can work together to provide power, effectively improving drive flexibility.

[0055] This operating mode, for example, can provide digital power voltage to the digital power terminal of the display driver circuit DDIC (DVDD) using a 40nm process. And... Figure 5 In the operating mode shown, the power supply circuit can have multiple power supply methods.

[0056] In the example embodiment, the power supply circuit can be powered only by the power management circuit 100. In this power supply mode, the power supply driving circuit 200 stops outputting the digital power supply voltage, and only the power management circuit 100 directly provides the first power supply voltage to the digital power supply terminal DVDD, which can be equal to the rated operating voltage, so the power consumption of the power management circuit 100 when supplying power is relatively small. From the above analysis, it can be known that when the power supply driving circuit 200 works to provide the digital power supply voltage to the digital power supply terminal DVDD, the power consumption of the voltage stabilizing module in the power supply driving circuit 200 is relatively large, so when powered only by the power management circuit 100, the driving power consumption of the display panel can be effectively reduced compared with being powered only by the power supply driving circuit 200.

[0057] In the example embodiment, the power management circuit 100 and the power supply driving circuit 200 can also supply power to the digital power supply terminal DVDD at the same time. In this power supply mode, the power management circuit 100 provides the first power supply voltage to the digital power supply terminal DVDD, and at the same time, the power supply driving circuit 200 provides the second power supply voltage to the digital power supply terminal DVDD under the driving of the first power supply voltage VDD1. When the power management circuit 100 and the power supply driving circuit 200 supply power to the digital power supply terminal DVDD at the same time, since the power supply capability of the power management circuit 100 is strong, i.e., the current supply capability is strong, the power supply driving circuit 200 only needs to output a small current, while the power management circuit 100 outputs a large current, so the driving power consumption when the power management circuit 100 and the power supply driving circuit 200 supply power to the digital power supply terminal DVDD at the same time is relatively low compared with being powered only by the power supply driving circuit 200.

[0058] As Figure 5As shown, the power supply driving circuit 200 and the digital power supply end DVDD are usually integrated in the same circuit, and the line impedance between them is small. The power management circuit 100 is arranged on the PCB, and needs to be connected with the power supply driving circuit 200 through the FPC. There is a PCB line resistance R1 and an FPC line resistance R2 between the power management circuit 100 and the power supply driving circuit 200, that is, the line resistance between the power management circuit 100 and the power supply driving circuit 200 is relatively large. When the color of the picture displayed by the display panel is relatively complex, the load current of the display panel is usually large. At this time, the resistance voltage drop (IR Drop) generated by the line impedance between the power management circuit 100 and the digital power supply end DVDD is large. When the color of the picture displayed by the display panel is relatively simple, the load current of the display panel is small, so that the resistance voltage drop generated by the line impedance between the power management circuit 100 and the digital power supply end DVDD is small. At this time, the power supply voltage transmitted to the digital power supply end DVDD becomes large, which may exceed the rated working voltage range of the digital power supply end DVDD. Therefore, the above-mentioned power supply mode of separately providing the digital power supply voltage for the digital power supply end DVDD by the power management circuit 100 or jointly providing the digital power supply voltage for the digital power supply end DVDD by the power management circuit 100 and the power supply driving circuit 200 can be applied to the display driving circuit DDIC with a relatively high rated working voltage of the digital power supply end DVDD, for example, especially to the display driving circuit DDIC with a 40nm process.

[0059] From the above analysis, it can be known that the display panel provided by the present disclosure can control the controllable switch to control the power management circuit 100 and the power supply driving circuit 200 to operate in different working modes according to the rated working voltage of the digital power supply end DVDD of the display panel. On the one hand, it can avoid that the provided digital voltage exceeds the rated working voltage range of the digital power supply end due to the change of the display load, and on the other hand, it can also meet the low-power consumption demand, thereby greatly improving the flexibility of the power supply circuit working and ensuring the normal display of the display panel.

[0060] The present disclosure also provides a display panel power management method, Figure 6 For the flow chart of the display panel power management method according to an embodiment of the present disclosure, as shown in the figure, the driving method can include the following steps: Figure 6 As shown, the driving method can include the following steps:

[0061] S110, providing a second digital power supply voltage for the digital power supply end through one voltage stabilizing module in the power supply driving circuit;

[0062] S120, providing a first digital power supply voltage for the digital power supply end or providing a power supply voltage for the voltage stabilizing module through the power management circuit.

[0063] In an example embodiment, the power supply driving circuit can be an internal circuit of the display driving circuit DDIC, and the digital power supply end can be a pin of the display driving circuit DDIC. As described above, the voltage stabilizing module can be a low dropout linear regulator LDO, and the power supply driving circuit can provide a stable digital power supply voltage, i.e., the second digital power supply voltage, to the digital power supply end through the LDO.

[0064] The power management circuit can be an integrated circuit PMIC, and the power management circuit can be configured in different working modes, i.e., the power management circuit can provide the first digital power supply voltage to the digital power supply end and can also provide a power supply voltage to the voltage stabilizing module in the power supply driving circuit.

[0065] In an example embodiment of the present disclosure, the power management circuit and the first voltage stabilizing module can be controlled to simultaneously provide a digital power supply voltage to the digital power supply end, and the above method can be optimized as follows:

[0066] S210, controlling the first switch to connect the voltage output end of the power management circuit and the digital power supply switching end, controlling the second switch to connect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power supply end and the voltage output end of the second voltage stabilizing module.

[0067] S220, controlling the first voltage stabilizing module in the power supply driving circuit to output the second digital power supply voltage and / or controlling the first voltage stabilizing module to provide the first digital power supply voltage to the digital power supply end.

[0068] As described in the above embodiment, in this mode, the power management circuit can provide a digital power supply voltage to the digital power supply end alone, the first voltage stabilizing module can provide a digital power supply voltage to the digital power supply end alone, or the power management circuit and the first voltage stabilizing module can simultaneously provide a digital power supply voltage to the digital power supply end.

[0069] In another example embodiment of the present disclosure, the power management circuit can also be controlled to provide a power supply voltage to the second voltage stabilizing module, and the second voltage stabilizing module can provide a digital power supply voltage to the digital power supply end, which can be specifically as follows:

[0070] S310, controlling the first switch to connect the voltage output end of the power management circuit and the second power supply voltage end, controlling the second switch to disconnect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power supply end and the voltage output end of the second voltage stabilizing module.

[0071] S320, controlling the power management circuit to provide a second power supply voltage to the second voltage stabilizing module in the power supply driving circuit, and the second voltage stabilizing module outputs a second digital power supply voltage to the digital power supply end in response to the second power supply voltage.

[0072] In yet another exemplary embodiment of the present disclosure, the power management circuit can also be controlled to provide a supply voltage to the first voltage stabilizing module, and the first voltage stabilizing module can provide a digital power supply voltage to the digital power supply end, which can be specifically:

[0073] S410, control the first switch to connect the voltage output end of the power management circuit and the second supply voltage end, control the second switch to connect the first supply voltage end and the second supply voltage end, and control the third switch to connect the digital power supply end and the digital power supply switching end.

[0074] S420, control the power management circuit to provide the first supply voltage to the first voltage stabilizing module in the power supply driving circuit, and the first voltage stabilizing module outputs the second digital power supply voltage to the digital power supply end in response to the first supply voltage.

[0075] In addition, the present disclosure also provides a display device, which can include the display panel according to any embodiment of the present disclosure.

[0076] Other embodiments of the present disclosure will be apparent to those skilled in the art with the consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptive changes of the present disclosure, which follow the general spirit of the present disclosure and include common knowledge or conventional technical means in the art that are not disclosed by the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a power supply driving circuit comprising a plurality of voltage stabilizing modules, the voltage stabilizing modules being configured to provide a second digital power supply voltage to a digital power supply end; a power management circuit configured to provide a first digital power supply voltage to the digital power supply end or a power supply voltage to the voltage stabilizing modules; wherein the digital power supply end is configured to provide a driving voltage for the display panel; the power supply voltage comprises a first power supply voltage and a second power supply voltage; and the power supply driving circuit comprises: a first voltage stabilizing module, a power input end of which is connected to the first power supply voltage end, a reference voltage end of which is connected to a first reference voltage end, and a feedback voltage end of which is connected to a voltage output end, the first voltage stabilizing module being configured to output the second digital power supply voltage after step-down of the first power supply voltage output by the first power supply voltage end; a second voltage stabilizing module, a power input end of which is connected to the second power supply voltage end, a reference voltage end of which is connected to a second reference voltage end, and a feedback voltage end of which is connected to the voltage output end, the second voltage stabilizing module being configured to output the second digital power supply voltage after step-down of the second power supply voltage output by the second power supply voltage end; the display panel further comprises: a first switch, a fixed end of which is connected to a voltage output end of the power management circuit, and a movable end of which is configured to be connected to the second power supply voltage end or a digital power supply adapter end; a second switch, which is connected between the first power supply voltage end and the second power supply voltage end; a third switch, a fixed end of which is connected to the digital power supply end, and a movable end of which is configured to be connected to the digital power supply adapter end or a voltage output end of the second voltage stabilizing module; the first power supply voltage is greater than the second power supply voltage.

2. The display panel of claim 1, wherein, the movable end of the first switch is connected to the digital power supply adapter end, the second switch is closed, and the movable end of the third switch is connected to the digital power supply adapter end; wherein the first voltage stabilizing module is configured to output the second digital power supply voltage and the second voltage stabilizing module is closed; the power management circuit is configured to output the first digital power supply voltage.

3. The display panel of claim 1, wherein, the movable end of the first switch is connected to the second power supply voltage end, the second switch is open, and the movable end of the third switch is connected to the voltage output end of the second voltage stabilizing module; wherein the second voltage stabilizing module is configured to output the second digital power supply voltage and the first voltage stabilizing module is closed; the power management circuit is configured to output the second power supply voltage.

4. The display panel of claim 1, wherein, the movable end of the first switch is connected to the second power supply voltage end, the second switch is closed, and the movable end of the third switch is connected to the digital power supply adapter end; wherein the first voltage stabilizing module is configured to output the second digital power supply voltage and the second voltage stabilizing module is closed; the power management circuit is further configured to output the second power supply voltage.

5. The display panel of claim 1, wherein, the display panel further comprises: a filter capacitor, a first end of which is connected to the digital power supply adapter end, and a second end of which is grounded.

6. The display panel of claim 1, wherein, the display panel further comprises a first circuit board, a second circuit board, and a third circuit board; wherein the power management circuit is located on the first circuit board, the power supply driving circuit is located on the second circuit board, and the third circuit board is connected between the first circuit board and the second circuit board.

7. The display panel of claim 1, wherein, The display panel further comprises a display driving circuit, wherein the display driving circuit comprises the power supply driving circuit and the digital power supply end.

8. A display panel power management method applied to the display panel of any one of claims 1-7, characterized in that, The method comprises: providing a second digital power supply voltage to the digital power supply end through a voltage stabilizing module in the power supply driving circuit; providing a first digital power supply voltage to the digital power supply end through the power management circuit or providing a power supply voltage to the voltage stabilizing module.

9. A display panel power management method applied to the display panel of claim 2, characterized in that, The method comprises: controlling the first switch to connect the voltage output end of the power management circuit and the digital power supply switching end, controlling the second switch to connect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power supply end and the digital power supply switching end; controlling the first voltage stabilizing module in the power supply driving circuit to output the second digital power supply voltage and / or controlling the power management circuit to provide the first digital power supply voltage to the digital power supply end.

10. A display panel power management method applied to the display panel of claim 3, characterized in that, The method comprises: controlling the first switch to connect the voltage output end of the power management circuit and the second power supply voltage end, controlling the second switch to disconnect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power supply end and the voltage output end of the second voltage stabilizing module; controlling the power management circuit to provide the second power supply voltage to the second voltage stabilizing module in the power supply driving circuit, and the second voltage stabilizing module outputs the second digital power supply voltage to the digital power supply end in response to the second power supply voltage.

11. A display panel power management method applied to the display panel of claim 4, characterized in that, The method comprises: controlling the first switch to connect the voltage output end of the power management circuit and the second power supply voltage end, controlling the second switch to connect the first power supply voltage end and the second power supply voltage end, and controlling the third switch to connect the digital power supply end and the digital power supply switching end; controlling the power management circuit to provide the first power supply voltage to the first voltage stabilizing module in the power supply driving circuit, and the first voltage stabilizing module outputs the second digital power supply voltage to the digital power supply end in response to the first power supply voltage.

12. A display device comprising: The display panel according to any one of claims 1-7.

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