Voltage supply circuit, voltage supply method, and display device

Abstract

The application provides a voltage supply circuit, a voltage supply method and a display device. The voltage supply circuit is applied to the display device, the display device comprises a driving integrated circuit; the voltage supply circuit comprises a feedback control circuit and a voltage conversion circuit; the driving integrated circuit comprises a power supply voltage feedback end; the feedback control circuit converts a feedback power supply voltage provided by the power supply voltage feedback end to obtain a feedback voltage; a voltage value of the feedback voltage changes with a change of a voltage value of the feedback power supply voltage; the voltage conversion circuit subtracts the feedback voltage from an input voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain a net input power supply voltage. The application can reduce the power consumption of the driving integrated circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a voltage providing circuit, a voltage providing method and a display device. BACKGROUND

[0002] In the process of normal screen display, the normal work of various IP (intellectual property) algorithm modules in the driving integrated circuit is the prerequisite for the normal screen display. In order to ensure the user experience, prolong the battery use time of the whole machine, improve the battery use efficiency, and reduce the power consumption of the driving integrated circuit, it is very beneficial for the whole machine.

[0003] In the related technology, the input power supply voltage end of the driving integrated circuit contributes to digital power consumption. When the input power supply voltage enters the driving integrated circuit, it is used for the operation of various IP modules. Basically, the power supply of all IP modules is supplied by the input power supply voltage, which leads to a large power consumption ratio of the input power supply voltage end of the driving integrated circuit, accounting for about 30% of the overall power consumption of the driving integrated circuit. In the related driving integrated circuit, the input power supply voltage is a constant voltage, which does not change no matter what picture the screen displays, which leads to the fact that the input power supply voltage must be at a high level for a long time to prevent the screen from failing to display complex pictures due to insufficient input power supply voltage, thereby affecting the screen display effect, which leads to high power consumption of the input power supply voltage end. SUMMARY

[0004] The main purpose of the present application is to provide a voltage providing circuit, a voltage providing method and a display device, which solve the problem of high power consumption of the driving integrated circuit in the prior art.

[0005] In one aspect, the embodiment of the present application provides a voltage providing circuit applied to a display device, wherein the display device comprises a driving integrated circuit; the voltage providing circuit comprises a feedback control circuit and a voltage conversion circuit; the driving integrated circuit comprises a power supply voltage feedback end;

[0006] The feedback control circuit is electrically connected with the power supply voltage feedback end and a feedback voltage end respectively, is used for converting the feedback power supply voltage provided by the power supply voltage feedback end, obtaining and providing the feedback voltage through the feedback voltage end; the voltage value of the feedback voltage changes with the change of the voltage value of the feedback power supply voltage;

[0007] The voltage conversion circuit is electrically connected with the voltage input end and the feedback voltage end respectively, and is used for subtracting the feedback voltage from the input voltage provided by the voltage input end to obtain a net input power supply voltage, and amplifying the net input power supply voltage to obtain an amplified net input power supply voltage and provide the amplified net input power supply voltage through an output end of the voltage conversion circuit.

[0008] Optionally, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases.

[0009] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.

[0010] The voltage providing circuit further comprises a voltage stabilizing circuit, the output end of the voltage conversion circuit is electrically connected with a power supply voltage output end, and the power supply voltage output end is used for providing an output power supply voltage.

[0011] The voltage stabilizing circuit is electrically connected with the output end of the voltage conversion circuit, and is used for stabilizing the amplified net input power supply voltage.

[0012] The voltage providing circuit further comprises a voltage stabilizer and a voltage output circuit, and the driving integrated circuit further comprises a power supply voltage input end.

[0013] The voltage stabilizer is electrically connected with the voltage output circuit, and is used for providing a digital power supply voltage to the voltage output circuit.

[0014] The voltage output circuit is further electrically connected with the power supply voltage output end, is used for receiving the output power supply voltage, generates an input power supply voltage according to the output power supply voltage and the digital power supply voltage, and provides the input power supply voltage to the power supply voltage input end.

[0015] Optionally, the power supply voltage feedback end is arranged on a side of the power supply voltage input end close to the feedback control circuit.

[0016] Optionally, the feedback control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor.

[0017] A first end of the first resistor is electrically connected with the power supply voltage feedback end, and a second end of the first resistor is electrically connected with a first node.

[0018] A first end of the second resistor is electrically connected with the first node, and a second end of the second resistor is electrically connected with a second node.

[0019] A first end of the third resistor is electrically connected with the second node, and a second end of the third resistor is electrically connected with a direct current voltage end; the second node is electrically connected with the feedback voltage end.

[0020] a first end of the fourth resistor is electrically connected with the power voltage output end, and a second end of the fourth resistor is electrically connected with the first node;

[0021] a first end of the first capacitor is electrically connected with the first node, and a second end of the first capacitor is electrically connected with the second node.

[0022] Optionally, the voltage stabilizing circuit comprises at least one voltage stabilizing capacitor.

[0023] a first end of the voltage stabilizing capacitor is electrically connected with the power voltage output end, and a second end of the voltage stabilizing capacitor is electrically connected with the ground end.

[0024] In a second aspect, an embodiment of the present application provides a voltage providing method applied to the voltage providing circuit, and the voltage providing method comprises:

[0025] the feedback control circuit converts the feedback power voltage provided by the power voltage feedback end to obtain a feedback voltage and provide the feedback voltage through the feedback voltage end; the voltage value of the feedback voltage changes with the voltage value of the feedback power voltage;

[0026] the voltage conversion circuit subtracts the feedback voltage from the input voltage provided by the voltage input end to obtain a net input power voltage, amplifies the net input power voltage, and provides the amplified net input power voltage through the output end of the voltage conversion circuit.

[0027] Optionally, when the voltage value of the feedback power voltage increases, the voltage value of the feedback voltage increases;

[0028] when the voltage value of the feedback power voltage decreases, the voltage value of the feedback voltage decreases.

[0029] Optionally, the voltage providing circuit further comprises a voltage stabilizing circuit; and the voltage providing method further comprises:

[0030] the voltage stabilizing circuit stabilizes the amplified net input power voltage to obtain an output power voltage and provide the output power voltage through the power voltage output end.

[0031] Optionally, the voltage providing circuit further comprises a voltage stabilizer and a voltage output circuit; and the voltage providing method further comprises:

[0032] the voltage stabilizer provides a digital power voltage to the voltage output circuit;

[0033] the voltage output circuit receives the output power voltage, generates an input power voltage according to the output power voltage and the digital power voltage, and provides the input power voltage to the power voltage input end.

[0034] In a third aspect, the embodiments of the present application provide a display device, comprising a driving integrated circuit and the voltage providing circuit as described above; the driving integrated circuit comprises a power supply voltage feedback end;

[0035] The voltage providing circuit comprises a feedback control circuit which is electrically connected with the power supply voltage feedback end.

[0036] Optionally, the voltage providing circuit further comprises a voltage stabilizing circuit, a voltage stabilizer and a voltage output circuit, and the driving integrated circuit further comprises a power supply voltage input end;

[0037] The voltage output circuit is electrically connected with the power supply voltage input end, and is configured to provide an input power supply voltage for the power supply voltage input end.

[0038] The display device as described in at least one embodiment of the present application further comprises a power management integrated circuit; and the voltage conversion circuit comprised in the voltage providing circuit is included in the power management integrated circuit.

[0039] The display device as described in at least one embodiment of the present application further comprises a circuit board;

[0040] The feedback control circuit and the voltage stabilizing circuit are arranged on the circuit board.

[0041] Optionally, the voltage stabilizer and the voltage output circuit are included in the driving integrated circuit.

[0042] The voltage providing circuit, the voltage providing method and the display device as described in the embodiments of the present application provide a feedback power supply voltage through the power supply voltage feedback end, the feedback power supply voltage reflects the heavy load degree of displaying different images, the feedback power supply voltage corresponding to different heavy load degrees is provided to the feedback control circuit, the feedback control circuit converts the feedback power supply voltage to obtain a feedback voltage; the conversion circuit subtracts the input voltage from the feedback voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain an amplified net input power supply voltage. The voltage providing circuit as described in the embodiments of the present application can adjust the input power supply voltage (the input power supply voltage is positively correlated with the amplified net input power supply voltage) according to the heavy load degree of the current displayed image; when the current displayed image corresponds to a high heavy load degree, the input power supply voltage is controlled to be increased; when the current displayed image corresponds to a low heavy load degree, the input power supply voltage is controlled to be decreased; so that the input power supply voltage can be adjusted to the lowest possible under the premise that all kinds of IP modules in the driving integrated circuit can operate normally and the screen can display pictures normally, so as to reduce the power consumption of the driving integrated circuit, thereby prolonging the battery usage time of the whole machine. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a structural diagram of a voltage providing circuit according to an embodiment of the present invention;

[0044] Figure 2 is a structural diagram of a voltage providing circuit according to an embodiment of the present invention;

[0045] Figure 3 A structural diagram of a voltage supply circuit according to an embodiment of the present invention;

[0046] Figure 4 is a structural diagram of a voltage providing circuit according to an embodiment of the present invention;

[0047] Figure 5A is a circuit diagram of a voltage providing circuit according to an embodiment of the present invention;

[0048] Figure 5B is a circuit diagram of a voltage providing circuit according to an embodiment of the present invention;

[0049] Figure 6 is a circuit diagram of a voltage providing circuit according to an embodiment of the present invention;

[0050] Figure 7A This is a diagram of the 8 Checker (chessboard) screen;

[0051] Figure 7B This is a diagram of the G128 Full White screen;

[0052] Figure 8 The diagram shows the first test voltage and the second test voltage in a 1×8 Checker screen and a G128 Full White screen when using the relevant power supply voltage scheme.

[0053] Figure 9 When the present invention is used Figure 6 In at least one embodiment shown, a schematic diagram of a first test voltage and a second test voltage in a 1×8 Checker image and a G128 Full White image;

[0054] Figure 10 It is a structural diagram of at least one embodiment of a driver integrated circuit. DETAILED DESCRIPTION

[0055] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0056] The transistor used in all the embodiments of the present application can be a thin film transistor or a field effect transistor or other devices with the same characteristics. In the embodiments of the present application, in order to distinguish the two poles of the transistor except the gate, one pole is called the first pole and the other pole is called the second pole.

[0057] In actual operation, when the transistor is a thin film transistor or a field effect transistor, the first pole can be a drain and the second pole can be a source, or the first pole can be a source and the second pole can be a drain.

[0058] The voltage providing circuit in the embodiments of the present application is applied to a display device, and the display device comprises a driving integrated circuit. Figure 1 As shown in the figure, the voltage providing circuit comprises a feedback control circuit 11 and a voltage conversion circuit 12; the driving integrated circuit comprises a power supply voltage feedback end DVDDP_RS;

[0059] The feedback control circuit 11 is electrically connected with the power supply voltage feedback end DVDDP_RS and a feedback voltage end FB respectively, is used for converting the feedback power supply voltage provided by the power supply voltage feedback end DVDDP_RS, obtaining and providing a feedback voltage through the feedback voltage end FB; the voltage value of the feedback voltage changes with the change of the voltage value of the feedback power supply voltage;

[0060] The voltage conversion circuit 12 is electrically connected with a voltage input end I1 and the feedback voltage end FB respectively, is used for subtracting the input voltage provided by the voltage input end I1 from the feedback voltage, obtaining a net input power supply voltage, amplifying the net input power supply voltage, obtaining and providing the amplified net input power supply voltage through the output end of the voltage conversion circuit 12.

[0061] An embodiment of the present invention provides a voltage supply circuit that provides a feedback power supply voltage by adding a power supply voltage feedback terminal DVDDP_RS. The feedback power supply voltage reflects the load level of different displayed images. The feedback power supply voltage corresponding to the load level is provided to a feedback control circuit 11. The feedback control circuit 11 converts the feedback power supply voltage to obtain a feedback voltage. A voltage conversion circuit 12 subtracts the input voltage from the feedback voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain an amplified net input power supply voltage. The voltage supply circuit of this embodiment of the present invention can adjust the input power supply voltage according to the load level of the currently displayed image (the input power supply voltage is positively correlated with the amplified net input power supply voltage). When the currently displayed image corresponds to a high load level, the input power supply voltage is increased; when the currently displayed image corresponds to a low load level, the input power supply voltage is decreased. This allows the input power supply voltage to be adjusted to the lowest possible level while ensuring that various IP modules within the driver integrated circuit can operate normally and the screen can display images normally, thereby reducing the power consumption of the driver integrated circuit and extending the battery life of the entire device.

[0062] In at least one embodiment of the present invention, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases;

[0063] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.

[0064] like Figure 2 As shown, at least one embodiment of the voltage conversion circuit may include a summing circuit 21 and an amplifying circuit 22;

[0065] The summing circuit 21 is electrically connected to the voltage input terminal I1 and the feedback voltage terminal FB, respectively, and is used to subtract the input voltage Vi provided by the voltage input terminal I1 from the feedback voltage Vf provided by the feedback voltage terminal FB to obtain a net input power supply voltage Vi';

[0066] The amplifier circuit 22 is used to amplify the net input power supply voltage Vi′ to obtain and provide the amplified net input power supply voltage through the power supply voltage output terminal VDDR.

[0067] Figure 2 In at least one embodiment shown, when in operation, Vi'=Vi-Vf;

[0068] A=Vddr / Vi', F=Vf / Vddr, Af=Vddr / Vi;

[0069] Vddr=A×Vi'=A×(Vi-Vf)=A×(Vi-F×Vddr);

[0070] Af=Vddr / Vi=A / (1+AxF);

[0071] Wherein, Vddr is the potential of VDDR, A is open loop gain, F is feedback coefficient, Af is closed loop gain, 1+AxF is feedback depth;

[0072] When |1+AxF|>1, |Af|<|A|, it is negative feedback, Vddr will be reduced;

[0073] When |1+AxF|<1, |Af|>|A|, it is positive feedback, Vddr will be increased.

[0074] As shown in Figure 3 On the basis of at least one embodiment shown in Figure 1 The voltage providing circuit further comprises a voltage stabilizing circuit 31, the output end of the voltage converting circuit 12 is electrically connected with a power voltage output end VDDR, and the power voltage output end VDDR is used for providing an output power voltage.

[0075] The voltage stabilizing circuit 31 is electrically connected with the output end of the voltage converting circuit 12, and is used for stabilizing the amplified net input power voltage.

[0076] As shown in Figure 4 On the basis of at least one embodiment shown in Figure 3 The voltage providing circuit further comprises a voltage stabilizing circuit 31, the output end of the voltage converting circuit 12 is electrically connected with a power voltage output end VDDR, and the power voltage output end VDDR is used for providing an output power voltage.

[0077] The voltage stabilizing circuit 31 is electrically connected with the output end of the voltage converting circuit 12, and is used for stabilizing the amplified net input power voltage.

[0078] The voltage output circuit VOT is further electrically connected with the power voltage output end VDDR and the power voltage input end DVDDP respectively, is used for receiving the output power voltage, generating an input power voltage according to the output power voltage and the digital power voltage, and providing the input power voltage to the power voltage input end DVDDP.

[0079] In at least one embodiment of the present application, the voltage stabilizer can be an LDO (low dropout regulator), and the PMIC (power management integrated circuit) identifies the voltage value and variation trend of the feedback power supply voltage, adjusts the output power supply voltage accordingly, and combines it with the digital power supply voltage DVDD generated by the LDO in the driving integrated circuit to obtain the input power supply voltage. At this time, the input power supply voltage can be dynamically adjusted by the feedback power supply voltage provided through the power supply voltage feedback end DVDDP RS, so as to reduce the DVDDP digital power consumption of the driving circuit and its proportion.

[0080] In a specific implementation, the voltage stabilizer LD and the voltage output circuit VOT can be integrated in the driving integrated circuit.

[0081] Optionally, the feedback control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor.

[0082] The first end of the first resistor is electrically connected to the power supply voltage feedback end, and the second end of the first resistor is electrically connected to a first node.

[0083] The first end of the second resistor is electrically connected to the first node, and the second end of the second resistor is electrically connected to a second node.

[0084] The first end of the third resistor is electrically connected to the second node, and the second end of the third resistor is electrically connected to a direct current voltage end. The second node is electrically connected to the feedback voltage end.

[0085] The first end of the fourth resistor is electrically connected to the power supply voltage output end, and the second end of the fourth resistor is electrically connected to the first node.

[0086] The first end of the first capacitor is electrically connected to the first node, and the second end of the first capacitor is electrically connected to the second node.

[0087] Optionally, the direct current voltage end can be a ground end or a low voltage end, but is not limited thereto.

[0088] Optionally, the voltage stabilizing circuit includes at least one voltage stabilizing capacitor.

[0089] The first end of the voltage stabilizing capacitor is electrically connected to the power supply voltage output end, and the second end of the voltage stabilizing capacitor is electrically connected to the ground end.

[0090] As shown in Figure 5A As shown in at least one embodiment shown in Figure 3 The voltage conversion circuit can include a voltage conversion chip X1 and a first inductor L1.

[0091] The feedback control circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1; the driving integrated circuit DI comprises a power voltage feedback end DVDDP_RS and a power voltage input end DVDDP; the DVDDP_RS is electrically connected with the feedback voltage end VDDR_RS;

[0092] The first end of the first resistor R1 is electrically connected with the feedback voltage end VDDR_RS, and the second end of the first resistor R1 is electrically connected with a first node N1;

[0093] The first end of the second resistor R2 is electrically connected with the first node N1, and the second end of the second resistor R2 is electrically connected with a second node N2;

[0094] The first end of the third resistor R3 is electrically connected with the second node N2, and the second end of the third resistor R3 is electrically connected with a ground end; the second node N2 is electrically connected with a feedback voltage end FB;

[0095] The first end of the fourth resistor R4 is electrically connected with the power voltage output end VDDR, and the second end of the fourth resistor R4 is electrically connected with the first node N1;

[0096] The first end of the first capacitor C1 is electrically connected with the first node N1, and the second end of the first capacitor C1 is electrically connected with the second node N2;

[0097] The voltage conversion chip X1 comprises an input end VIN, an enable end EN, an output end LX1, a feedback voltage end FB and a ground end GND;

[0098] The input end VIN is electrically connected with a voltage input end I1, and the enable end EN is electrically connected with an enable signal end E1; the E1 provides an enable signal for the EN; the voltage input end I1 is used for providing an input voltage;

[0099] The first end of L1 is electrically connected with the output end LX1, and the second end of L1 is electrically connected with a power voltage output end VDDR;

[0100] The voltage stabilizing circuit comprises a second capacitor C2 and a third capacitor C3;

[0101] The first end of C2 is electrically connected with the power voltage output end VDDR, and the second end of C2 is electrically connected with the ground end;

[0102] The first end of C3 is electrically connected with the power voltage output end VDDR, and the second end of C3 is electrically connected with the ground end;

[0103] The voltage providing circuit can further comprise a fifth resistor R5 and a fourth capacitor C4;

[0104] A first end of R5 is electrically connected to E1, and a second end of R5 is electrically connected to the ground;

[0105] A first end of C4 is electrically connected to I1, and a second end of C4 is electrically connected to ground;

[0106] The voltage supply circuit may further include a voltage regulator LD and a voltage output circuit VOT; the voltage regulator LD and the voltage output circuit VOT may be integrated into a driving integrated circuit DI;

[0107] The power supply voltage output terminal VDDR is electrically connected to the voltage output circuit VOT through the capacitor unit 50;

[0108] The voltage regulator LD is electrically connected to the voltage output circuit VOT, and is used to provide a digital power supply voltage DVDD to the voltage output circuit VOT;

[0109] The voltage output circuit VOT is also electrically connected to the power supply voltage input terminal DVDDP, for receiving the output power supply voltage, generating an input power supply voltage according to the output power supply voltage and the digital power supply voltage, and providing the input power supply voltage to the power supply voltage input terminal DVDDP.

[0110] exist Figure 5A In at least one embodiment shown, the DC voltage terminal is a ground terminal.

[0111] exist Figure 5A In at least one embodiment shown, the output power voltage provided by VDDR is positively correlated with the input power voltage received by the power voltage input terminal DVDDP, that is, when the voltage value of the output power voltage increases, the voltage value of the input power voltage increases; when the voltage value of the output power voltage decreases, the voltage value of the input power voltage decreases.

[0112] exist Figure 5A In at least one embodiment shown, the pin labeled PG is the second pin of X1 , and the capacitor unit 50 may include a plurality of capacitors.

[0113] exist Figure 5A In at least one embodiment shown, X1 and L1 may be integrated into a PMIC, R1, R2, R3, R4, C1, C2, and C3 may all be disposed on an FPC (flexible printed circuit), and X1 is a summing circuit module within the PMIC.

[0114] The present invention Figure 5A At least one embodiment of the voltage providing circuit shown in FIG.

[0115] The DVDDP_RS provides a feedback power supply voltage to the feedback voltage terminal VDDR_RS, the feedback power supply voltage is written into N1 through R1, is divided through R2 and R3 to obtain a feedback voltage Vf, and the feedback voltage is written into FB;

[0116] The voltage conversion chip X1 is used to subtract the feedback voltage received by the feedback voltage terminal FB from the input voltage to obtain a net input power supply voltage, amplify the net input power supply voltage, and provide the amplified net input power supply voltage through the output terminal LX1;

[0117] The amplified net input power supply voltage is stabilized through C2 and C3 to obtain an output power supply voltage and provide the output power supply voltage through the power supply voltage output terminal VDDR.

[0118] In at least one embodiment of the voltage providing circuit shown in the present application, Figure 5A In at least one embodiment of the voltage providing circuit shown in the present application,

[0119] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.

[0120] In at least one embodiment of the voltage providing circuit shown in the present application, Figure 5A In at least one embodiment of the voltage providing circuit shown in the present application,

[0121] When the load degree of the current display image is high, the voltage value of the feedback power supply voltage provided by the DVDDP_RS is low, the voltage value of the feedback voltage obtained according to the feedback power supply voltage is also low, the voltage conversion chip X1 subtracts the feedback voltage from the input voltage to obtain a net input power supply voltage, amplifies the net input power supply voltage to obtain an amplified net input power supply voltage, and further makes the input power supply voltage received by the DVDDP higher, so as to meet the requirement of high load display image;

[0122] When the load degree of the current display image is low, the voltage value of the feedback power supply voltage provided by the DVDDP_RS is high, the voltage value of the feedback voltage obtained according to the feedback power supply voltage is also high, the voltage conversion chip X1 subtracts the feedback voltage from the input voltage to obtain a net input power supply voltage, amplifies the net input power supply voltage to obtain an amplified net input power supply voltage, and further makes the input power supply voltage received by the DVDDP lower, so as to reduce the power consumption.

[0123] In at least one embodiment of the voltage providing circuit shown in the present application, Figure 5AIn at least one embodiment of the voltage supply circuit shown, during operation, the potential of N1 is determined by VDDR_RS, the potential of N2 is determined by the potential of N1, the potential of N2 is the same as the feedback voltage received by FB, and the potential of VDDR_RS is the same as the potential of DVDDP_RS. When the displayed image switches from a low-reload image to a high-reload image, the voltage of the feedback power supply voltage provided by DVDDP_RS decreases, causing the potentials of N1 and N2 to decrease. Returning to the summing circuit module within the PMIC, the voltage of the feedback voltage decreases, causing the net input voltage to increase, forming positive feedback, thereby increasing the output power supply voltage under high-reload images and also increasing the input power supply voltage received by DI. Conversely, when switching from a high-reload image to a low-reload image, the voltage of the feedback power supply voltage provided by DVDDP_RS increases, causing the potentials of N1 and N2 to increase. Returning to the summing circuit module within the PMIC, the voltage of the feedback voltage increases, causing the net input voltage to decrease, forming negative feedback, thereby reducing the output power supply voltage under low-reload images and also reducing the input power supply voltage received by DI.

[0124] The present invention Figure 5A When at least one embodiment of the voltage providing circuit is in operation, the digital power consumption of the driver integrated circuit DI is reduced by integrating the dynamically changing input power supply voltage.

[0125] In the present invention Figure 5A In at least one embodiment of the voltage providing circuit shown, the first inductor L1 can be used for voltage stabilization, and the capacitor unit 50 can include a capacitor device between the circuit board F1 and the driver integrated circuit DI.

[0126] The present invention Figure 5A In at least one embodiment of the voltage supply circuit shown, when in operation, DVDDP_RS provides a feedback power supply voltage to the feedback voltage terminal VDDR_RS. The feedback power supply voltage is written to N1 via R1, and then divided by R2 and R3 to obtain a feedback voltage Vf, which is then written to FB.

[0127] In specific implementation, since the operating voltage range of the driving integrated circuit DI is different from the operating voltage range of the voltage conversion chip X1, it is necessary to convert the feedback power supply voltage provided by DVDDP_RS through R1, R2, R3 and R4 to obtain and provide the feedback voltage Vf to FB to meet the operating voltage range of the voltage conversion chip X1.

[0128] like Figure 5B In the embodiment, X1, C4, R5 and L1 can be set in the power management integrated circuit PMIC;

[0129] R1, R2, R3, R4, C1, C2, C3 and the capacitor unit 50 can be arranged in a circuit board F1, which can be a flexible circuit board.

[0130] In order to verify the effectiveness of the technical solution of dynamically adjusting the input power supply voltage according to the load degree of the current display image, spot measurements are made on the output power supply voltage output by the PMIC and the input power supply voltage received by the DI.

[0131] As shown in Figure 6 TST1 is the first test point and TST2 is the second test point.

[0132] The first test point TST1 is arranged on the connecting line between VDDR and L1, and the second test point TST2 is arranged on the connecting line between the capacitor unit 50 and DI.

[0133] TEST1 represents the input voltage of the first capacitor connected to VDDR on the FPC from the voltage output by the second end of L1 of the PMIC. The voltage drop of the wire between the PMIC and the first capacitor connected to VDDR on the FPC is ignored, and it can be determined that the first test voltage on TEST1 is equal to the voltage provided by LX1.

[0134] The second test voltage on TEST2 is the output voltage of the last capacitor between VDDR and DI on the FPC, and the voltage drop of the last wire is ignored. It can be determined that the second test voltage on TEST2 is equal to the voltage received by the voltage output circuit VOT in DI.

[0135] As shown in Figure 8 When the related power supply voltage providing scheme is adopted, whether under the high load 1x8 Checker (checkerboard) picture (as shown in Figure 7A ) or under the low load G128 Full White (full white) picture (as shown in Figure 7B ), the first test voltage and the second test voltage are both the voltage values corresponding to the high load picture, and the calculated power consumption is about 275.6 mW.

[0136] As shown in Figure 9 , when the power supply voltage providing scheme of the present application is adopted, the first test voltage and the second test voltage are both the voltage values corresponding to the low load picture, and the calculated power consumption is about 230.6 mW. Figure 6In at least one embodiment shown, when the current display screen is a 1×8 Checker screen, the input power voltage received by the DVDDP is the same as in the related art; however, when the current display screen is a G128 Full White screen, the first test voltage is reduced from 1.514V to 1.437V, the second test voltage is reduced from 1.379V to 1.344V, and the current is also reduced from approximately 100 mA to approximately 80mA. The calculated power consumption is approximately 244.3 mW. After adopting at least one embodiment of the present invention, the power consumption benefit of displaying the same screen is approximately 31.3 mW, which is approximately 12% lower than the power consumption of related designs. The power consumption reduction is more obvious when displaying lower-load screens.

[0137] like Figure 10 As shown, the driver integrated circuit may include a first power supply voltage input terminal DVDDP1, a second power supply voltage input terminal DVDDP2, a third power supply voltage input terminal DVDDP3 and a power supply voltage feedback terminal DVDDP_RS; the power supply voltage feedback terminal DVDDP_RS is arranged on a side of each power supply voltage input terminal close to the feedback control circuit;

[0138] The outermost pin is used as the power supply voltage feedback terminal DVDDP_RS to detect the overload level of the screen display image.

[0139] In at least one embodiment of the present invention, the outermost pin is selected as the power supply voltage feedback terminal DVDDP_RS based on three considerations: the location of the driver integrated circuit pins, the difficulty of layout, and the Hi_Z (high-impedance) feedback signal. Using the outermost pin as the power supply voltage feedback terminal DVDDP_RS can shorten the DVDDP_RS channel to the shortest possible extent, minimize signal interference caused by trace impedance, and prevent overlap between the signals provided by DVDDP_RS and DVDDP during FPC layout. Furthermore, the outermost pin is easiest to implement Hi_Z high-impedance signal processing, which can prevent interference caused by external signal feedback.

[0140] The voltage providing method according to an embodiment of the present invention is applied to the above-mentioned voltage providing circuit, and the voltage providing method includes:

[0141] The feedback control circuit converts the feedback power supply voltage provided by the power supply voltage feedback terminal to obtain and provide a feedback voltage through the feedback voltage terminal; the voltage value of the feedback voltage changes with the change of the voltage value of the feedback power supply voltage;

[0142] The voltage conversion circuit subtracts the input voltage provided by the voltage input end from the feedback voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain an amplified net input power supply voltage and provide the amplified net input power supply voltage through the output end of the voltage conversion circuit.

[0143] In the voltage providing method, the feedback power supply voltage reflecting the heavy load degree of displaying different images is provided to the feedback control circuit, the feedback control circuit converts the feedback power supply voltage to obtain the feedback voltage, and the conversion circuit subtracts the input voltage from the feedback voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain an amplified net input power supply voltage. In the voltage providing method, the input power supply voltage (positively correlated with the amplified net input power supply voltage) can be adjusted according to the heavy load degree of the current displayed image; when the current displayed image corresponds to a high heavy load degree, the input power supply voltage is controlled to be increased; when the current displayed image corresponds to a low heavy load degree, the input power supply voltage is controlled to be decreased; so that the input power supply voltage is adjusted to be as low as possible under the premise that the various IP modules in the driving integrated circuit can normally operate and the screen can normally display images, thereby achieving the purpose of reducing the power consumption of the driving integrated circuit, thereby prolonging the battery use time of the whole machine.

[0144] In at least one embodiment of the present application, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases.

[0145] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.

[0146] In at least one embodiment of the present application, the voltage providing circuit further comprises a voltage stabilizing circuit; and the voltage providing method further comprises:

[0147] The voltage stabilizing circuit stabilizes the amplified net input power supply voltage to obtain an output power supply voltage and provide the output power supply voltage through the power supply voltage output end.

[0148] Optionally, the voltage providing circuit further comprises a voltage stabilizer and a voltage output circuit; and the voltage providing method further comprises:

[0149] The voltage stabilizer provides a digital power supply voltage to the voltage output circuit.

[0150] The voltage output circuit receives the output power supply voltage, generates an input power supply voltage according to the output power supply voltage and the digital power supply voltage, and provides the input power supply voltage to the power supply voltage input end.

[0151] The display device provided by the embodiment of the present application comprises a driving integrated circuit and the voltage providing circuit; the driving integrated circuit comprises a power supply voltage feedback end;

[0152] The voltage providing circuit comprises a feedback control circuit which is electrically connected with the power supply voltage feedback end.

[0153] Optionally, the voltage providing circuit further comprises a voltage stabilizing circuit, a voltage stabilizer and a voltage output circuit, and the driving integrated circuit further comprises a power supply voltage input end;

[0154] The voltage output circuit is electrically connected with the power supply voltage input end, and is used for providing an input power supply voltage for the power supply voltage input end.

[0155] The display device provided by at least one embodiment of the present application further comprises a power management integrated circuit; the voltage converting circuit comprised by the voltage providing circuit is contained in the power management integrated circuit.

[0156] In the specific implementation, the voltage converting circuit can be contained in the power management integrated circuit.

[0157] The display device provided by at least one embodiment of the present application further comprises a circuit board;

[0158] The feedback control circuit and the voltage stabilizing circuit are arranged on the circuit board.

[0159] In the specific implementation, the feedback control circuit and the voltage stabilizing circuit can be arranged on the circuit board, and the circuit board can be, for example, an FPC.

[0160] Optionally, the voltage stabilizer and the voltage output circuit are contained in the driving integrated circuit.

[0161] In the specific implementation, the voltage stabilizer and the voltage output circuit can be contained in the driving integrated circuit.

[0162] The above is the preferred embodiment of the present application, and it should be noted that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A voltage supply circuit, applied to a display device, wherein the display device includes a driver integrated circuit; characterized in that: The voltage supply circuit includes a feedback control circuit and a voltage conversion circuit; the driving integrated circuit includes a power supply voltage feedback terminal; The feedback control circuit is electrically connected to the power supply voltage feedback terminal and the feedback voltage terminal, respectively, and is used to convert the feedback power supply voltage provided by the power supply voltage feedback terminal to obtain and provide a feedback voltage through the feedback voltage terminal; the voltage value of the feedback voltage changes with the voltage value of the feedback power supply voltage; when the load level of the currently displayed image is low, the voltage value of the feedback power supply voltage is high, and when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases; when the load level of the currently displayed image is high, the voltage value of the feedback power supply voltage is low, and when the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases; The voltage conversion circuit is electrically connected to the voltage input terminal and the feedback voltage terminal respectively, and is used to subtract the input voltage provided by the voltage input terminal from the feedback voltage to obtain a net input power supply voltage, and amplify the net input power supply voltage to obtain and provide the amplified net input power supply voltage through the output terminal of the voltage conversion circuit.

2. The voltage supply circuit according to claim 1, wherein: It also includes a voltage stabilizing circuit; the output end of the voltage conversion circuit is electrically connected to the power supply voltage output end; the power supply voltage output end is used to provide an output power supply voltage; The voltage stabilizing circuit is electrically connected to the output end of the voltage conversion circuit and is used to stabilize the amplified net input power supply voltage.

3. The voltage supply circuit according to claim 2, wherein: It also includes a voltage stabilizer and a voltage output circuit; the driver integrated circuit also includes a power supply voltage input terminal; The voltage stabilizer is electrically connected to the voltage output circuit, and is used to provide a digital power supply voltage to the voltage output circuit; The voltage output circuit is also electrically connected to the power supply voltage output terminal, and is used to receive the output power supply voltage, generate an input power supply voltage according to the output power supply voltage and the digital power supply voltage, and provide the input power supply voltage to the power supply voltage input terminal.

4. The voltage supply circuit according to claim 3, wherein: The power supply voltage feedback terminal is arranged on a side of the power supply voltage input terminal close to the feedback control circuit.

5. The voltage providing circuit according to any one of claims 1 to 4, wherein: The feedback control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor; A first end of the first resistor is electrically connected to the power supply voltage feedback end, and a second end of the first resistor is electrically connected to the first node; A first end of the second resistor is electrically connected to the first node, and a second end of the second resistor is electrically connected to the second node; The first end of the third resistor is electrically connected to the second node, the second end of the third resistor is electrically connected to the DC voltage terminal; the second node is electrically connected to the feedback voltage terminal; A first end of the fourth resistor is electrically connected to the power supply voltage output terminal, and a second end of the fourth resistor is electrically connected to the first node; A first end of the first capacitor is electrically connected to the first node, and a second end of the first capacitor is electrically connected to the second node.

6. The voltage supply circuit according to claim 2, wherein: The voltage stabilizing circuit includes at least one voltage stabilizing capacitor; The first end of the voltage-stabilizing capacitor is electrically connected to the power supply voltage output end, and the second end of the voltage-stabilizing capacitor is electrically connected to the ground end.

7. A voltage providing method, applied to the voltage providing circuit according to any one of claims 1 to 6, characterized in that: The voltage providing method comprises: The feedback control circuit converts the feedback power supply voltage provided by the power supply voltage feedback terminal to obtain and provide a feedback voltage through the feedback voltage terminal; the voltage value of the feedback voltage changes with the voltage value of the feedback power supply voltage; when the reload level of the currently displayed image is low, the voltage value of the feedback power supply voltage is high, and when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases; when the reload level of the currently displayed image is high, the voltage value of the feedback power supply voltage is low, and when the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases; The voltage conversion circuit subtracts the input voltage provided by the voltage input terminal from the feedback voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain and provide the amplified net input power supply voltage through the output terminal of the voltage conversion circuit.

8. The voltage providing method according to claim 7, wherein: The voltage supply circuit further includes a voltage stabilizing circuit; and the voltage supply method further includes: The voltage stabilizing circuit stabilizes the amplified net input power supply voltage to obtain and provide an output power supply voltage through the power supply voltage output terminal.

9. The voltage providing method according to claim 8, wherein: The voltage supply circuit further includes a voltage stabilizer and a voltage output circuit; and the voltage supply method further includes: The voltage regulator provides a digital power supply voltage to the voltage output circuit; The voltage output circuit receives the output power voltage, generates an input power voltage according to the output power voltage and the digital power voltage, and provides the input power voltage to a power voltage input terminal.

10. A display device, characterized in that: The device comprises a driving integrated circuit and a voltage supply circuit according to any one of claims 1 to 6; the driving integrated circuit comprises a power supply voltage feedback terminal; The voltage providing circuit includes a feedback control circuit electrically connected to the power supply voltage feedback terminal.

11. The display device according to claim 10, wherein The voltage supply circuit further includes a voltage stabilizing circuit, a voltage stabilizer and a voltage output circuit, and the driving integrated circuit further includes a power supply voltage input terminal; The voltage output circuit is electrically connected to the power supply voltage input terminal and is used to provide an input power supply voltage to the power supply voltage input terminal.

12. The display device according to claim 10, wherein It also includes a power management integrated circuit; the voltage conversion circuit included in the voltage providing circuit is included in the power management integrated circuit.

13. The display device according to claim 11, wherein Also includes circuit boards; The feedback control circuit and the voltage stabilizing circuit are arranged on the circuit board.

14. The display device according to claim 11, wherein The voltage regulator and the voltage output circuit are included in the driving integrated circuit.

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