Voltage supply circuit, voltage supply method and display device

Abstract

The invention provides a voltage supply circuit, a voltage supply method and a display device. The voltage supply circuit is applied to the display device, and 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 feedback power supply voltage provided by the power supply voltage feedback end to obtain feedback voltage; the voltage value of the feedback voltage changes along with the change of the voltage value of the feedback power supply voltage; the input voltage and the feedback voltage of the voltage conversion circuit are subtracted to obtain net input power supply voltage, and the net input power supply voltage is amplified to obtain the net input power supply voltage. The power consumption of the driving integrated circuit can be reduced.

Description

Technical Field

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

[0002] During the normal display process of the screen, the normal operation of various IP (intellectual property) algorithm modules inside the driver integrated circuit is the prerequisite for normal screen display. In order to ensure the user experience, extending the battery life of the whole machine, improving battery efficiency, and reducing the power consumption of the driver integrated circuit are of great benefit to the whole machine.

[0003] In the related art, the input power supply voltage end of the driver integrated circuit contributes to the digital power consumption. After the input power supply voltage enters the driver integrated circuit, it is used to operate various IP modules. Basically, all IP modules are powered by the input power supply voltage, which leads to a large proportion of the power consumption of the input power supply voltage end of the driver integrated circuit, accounting for about 30% of the overall power consumption of the driver integrated circuit; in the related driver integrated circuit, the input power supply voltage is a constant voltage. No matter what picture is displayed on the screen, the input power supply voltage will not change, resulting in the input power supply voltage having to be at a high level for a long time to prevent the screen from displaying complex pictures. Due to insufficient input power supply voltage, various IP modules cannot operate normally, thereby affecting the screen display effect, which leads to high power consumption of the input power supply voltage end. Summary of the invention

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

[0005] In one aspect, an embodiment of the present invention provides a voltage supply circuit, which is applied to a display device, wherein the display device includes a driver integrated circuit; the voltage supply circuit includes a feedback control circuit and a voltage conversion circuit; the driver integrated circuit includes a power supply voltage feedback terminal;

[0006] 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 the 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;

[0007] 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.

[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 supply circuit described in at least one embodiment of the present invention further 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;

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

[0012] The voltage supply circuit described in at least one embodiment of the present invention further includes a voltage stabilizer and a voltage output circuit; the driver integrated circuit further includes a power supply voltage input terminal;

[0013] 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;

[0014] 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.

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

[0016] Optionally, the feedback control circuit includes 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 to the power supply voltage feedback end, and a second end of the first resistor is electrically connected to the first node;

[0018] 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;

[0019] 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;

[0020] 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;

[0021] 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.

[0022] Optionally, the voltage stabilizing circuit includes at least one voltage stabilizing capacitor;

[0023] 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.

[0024] In a second aspect, an embodiment of the present invention provides a voltage providing method, which is applied to the above-mentioned voltage providing circuit, and the voltage providing method includes:

[0025] 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;

[0026] 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.

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

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

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

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

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

[0032] The voltage regulator provides a digital power supply 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 a power voltage input terminal.

[0034] In a third aspect, an embodiment of the present invention provides a display device, comprising a driver integrated circuit and the above-mentioned voltage supply circuit; the driver integrated circuit comprises a power supply voltage feedback terminal;

[0035] The voltage supply circuit includes a feedback control circuit electrically connected to the power supply voltage feedback terminal.

[0036] Optionally, the voltage supply circuit further includes a voltage stabilization circuit, a voltage stabilizer and a voltage output circuit, and the driver integrated circuit further includes a power supply voltage input terminal;

[0037] 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.

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

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

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

[0041] Optionally, the voltage regulator and the voltage output circuit are included in the driver integrated circuit.

[0042] The voltage supply circuit, voltage supply method and display device described in the embodiment of the present invention provide feedback power supply voltage by adding a power supply voltage feedback terminal, the feedback power supply voltage reflects the overload degree of displaying different images, and provides feedback power supply voltages corresponding to different overload degrees to the feedback control circuit, the feedback control circuit converts the feedback power supply voltage to obtain the feedback voltage; the conversion circuit subtracts the input voltage from the feedback voltage to obtain the net input power supply voltage, and amplifies the net input power supply voltage to obtain the amplified net input power supply voltage. The voltage supply circuit described in the embodiment of the present invention can adjust the input power supply voltage according to the overload degree of the current displayed image (the input power supply voltage is positively correlated with the amplified net input power supply voltage); when the current displayed image corresponds to a high overload degree, the input power supply voltage is controlled to be increased; when the current displayed image corresponds to a low overload 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 level under the premise of ensuring that various IP modules inside the driver integrated circuit can operate normally and the screen can display the picture normally, thereby achieving the purpose of reducing the power consumption of the driver integrated circuit, thereby extending the battery life of the whole machine. BRIEF DESCRIPTION OF THE 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 providing 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] Fig. 7A This is a schematic diagram of the 8Checker (chessboard) screen;

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

[0052] Figure 8 It is a schematic diagram of a first test voltage and a second test voltage in a 1×8 Checker screen and a G128 Full White screen when a relevant power supply voltage providing scheme is adopted;

[0053] Fig. 9 When the present invention is adopted Figure 6 At least one embodiment shown is a schematic diagram of a first test voltage and a second test voltage in a 1×8 Checker screen and a G128 Full White screen;

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

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices with the same characteristics. In the embodiments of the present invention, to distinguish the two electrodes of the transistor except the gate, one electrode is called the first electrode and the other electrode is called the second electrode.

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

[0058] The voltage supply circuit described in the embodiment of the present invention is applied to a display device, wherein the display device includes a driver integrated circuit; Figure 1 As shown, the voltage supply circuit includes a feedback control circuit 11 and a voltage conversion circuit 12; the driving integrated circuit includes a power supply voltage feedback terminal DVDDP_RS;

[0059] The feedback control circuit 11 is electrically connected to the power supply voltage feedback terminal DVDDP_RS and the feedback voltage terminal FB respectively, and is used to convert the feedback power supply voltage provided by the power supply voltage feedback terminal DVDDP_RS to obtain and provide a feedback voltage through the feedback voltage terminal 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 to the voltage input terminal I1 and the feedback voltage terminal FB, respectively, and is used to subtract the input voltage provided by the voltage input terminal I1 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 12.

[0061] The embodiment of the present invention provides a voltage supply circuit, which provides a feedback power supply voltage by adding a power supply voltage feedback terminal DVDDP_RS. The feedback power supply voltage reflects the overload degree of displaying different images, and provides the feedback power supply voltage corresponding to different overload degrees to the feedback control circuit 11. The feedback control circuit 11 converts the feedback power supply voltage to obtain the feedback voltage; the voltage conversion circuit 12 subtracts the input voltage from the feedback voltage to obtain the net input power supply voltage, and amplifies the net input power supply voltage to obtain the amplified net input power supply voltage. The voltage supply circuit of the embodiment of the present invention can adjust the input power supply voltage according to the overload degree of the current displayed image (the input power supply voltage is positively correlated with the amplified net input power supply voltage); when the current displayed image corresponds to a high overload degree, the input power supply voltage is controlled to be increased; when the current displayed image corresponds to a low overload 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 value under the premise of ensuring that various IP modules inside the driver integrated circuit can operate normally and the screen can display the picture normally, thereby achieving the purpose of reducing the power consumption of the driver integrated circuit, thereby extending the battery life of the whole machine.

[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 + A × F);

[0071] Wherein, Vddr is the potential of VDDR, A is the open-loop gain, F is the feedback factor, Af is the closed-loop gain, and 1+A×F is the feedback depth;

[0072] When |1+A×F|>1, |Af|<|A|, it is negative feedback; Vddr will decrease;

[0073] When |1+A×F|<1, |Af|>|A|, which is positive feedback; Vddr will increase.

[0074] like Figure 3 As shown, in Figure 1 Based on at least one embodiment shown, the voltage providing circuit described in at least one embodiment of the present invention further includes a voltage stabilizing circuit 31; the output end of the voltage conversion circuit 12 is electrically connected to the power supply voltage output end VDDR; the power supply voltage output end VDDR is used to provide an output power supply voltage;

[0075] The voltage stabilizing circuit 31 is electrically connected to the output end of the voltage conversion circuit 12 and is used to stabilize the amplified net input power supply voltage.

[0076] like Figure 4 As shown, in Figure 3 Based on at least one embodiment shown in the figure, the voltage supply circuit described in at least one embodiment of the present invention further includes a voltage regulator LD and a voltage output circuit VOT; the driving integrated circuit further includes a power supply voltage input terminal DVDDP;

[0077] 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;

[0078] The voltage output circuit VOT is also electrically connected to the power supply voltage output terminal VDDR and the power supply voltage input terminal DVDDP, respectively, 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.

[0079] In at least one embodiment of the present invention, the voltage regulator may be an LDO (low dropout regulator), and the PMIC (power management integrated circuit) identifies the voltage value and change trend of the feedback power supply voltage, adjusts the output power supply voltage accordingly, and then combines it with the digital power supply voltage DVDD generated by the LDO in the driver integrated circuit to obtain the input power supply voltage. At this time, the feedback power supply voltage provided by the power supply voltage feedback terminal DVDDP_RS can be used to dynamically adjust the input power supply voltage, thereby reducing the DVDDP digital power consumption and its proportion of the driver circuit.

[0080] In a specific implementation, the voltage regulator LD and the voltage output circuit VOT may be integrated into a 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] 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;

[0083] 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;

[0084] 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;

[0085] 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;

[0086] 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.

[0087] Optionally, the DC voltage terminal may be a ground terminal or a low voltage terminal, 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] like Figure 5A As shown, in Figure 3 Based on at least one embodiment shown, the voltage conversion circuit may include a voltage conversion chip X1 and a first inductor L1;

[0091] The feedback control circuit includes 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 includes a power supply voltage feedback terminal DVDDP_RS and a power supply voltage input terminal DVDDP; DVDDP_RS is electrically connected to the feedback voltage terminal VDDR_RS;

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

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

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

[0095] A first end of the fourth resistor R4 is electrically connected to the power supply voltage output terminal VDDR, and a second end of the fourth resistor R4 is electrically connected to the first node N1;

[0096] A first end of the first capacitor C1 is electrically connected to the first node N1, and a second end of the first capacitor C1 is electrically connected to the second node N2;

[0097] The voltage conversion chip X1 includes an input terminal VIN, an enable terminal EN, an output terminal LX1, a feedback voltage terminal FB and a ground terminal GND which are electrically connected;

[0098] The input terminal VIN is electrically connected to the voltage input terminal I1, the enable terminal EN is electrically connected to the enable signal terminal E1, and E1 provides an enable signal for EN; the voltage input terminal I1 is used to provide an input voltage;

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

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

[0101] A first end of C2 is electrically connected to a power supply voltage output terminal VDDR, and a second end of C2 is electrically connected to a ground terminal;

[0102] A first end of C3 is electrically connected to a power supply voltage output terminal VDDR, and a second end of C3 is electrically connected to a ground terminal;

[0103] The voltage providing circuit according to at least one embodiment of the present invention may further include 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 the 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 in a driving integrated circuit DI;

[0107] The power supply voltage output terminal VDDR is electrically connected to the voltage output circuit VOT through a 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 can be integrated into the PMIC, R1, R2, R3, R4, C1, C2 and C3 can all be arranged on an FPC (flexible printed circuit), and X1 is a summing circuit module inside the PMIC.

[0114] The present invention Figure 5A At least one embodiment of the voltage providing circuit shown in FIG. 1 is in operation.

[0115] 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, and is divided by 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 for subtracting the input voltage from the feedback voltage received by the feedback voltage terminal FB to obtain a net input power supply voltage, and amplifying the net input power supply voltage to obtain and provide the amplified net input power supply voltage through the output terminal LX1;

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

[0118] In the present invention Figure 5A In at least one embodiment of the voltage providing circuit shown, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases;

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

[0120] The present invention Figure 5A At least one embodiment of the voltage providing circuit shown in FIG. 1 is in operation.

[0121] When the overload degree of the current displayed image is high, the voltage value of the feedback power supply voltage provided by DVDDP_RS is low, and 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 input voltage from the feedback voltage to obtain a net input power supply voltage, and amplifies the net input power supply voltage to obtain the amplified net input power supply voltage, thereby making the input power supply voltage received by DVDDP higher to meet the requirements of high overload display images;

[0122] When the overload level of the currently displayed image is low, the voltage value of the feedback power supply voltage provided by DVDDP_RS is relatively high, and the voltage value of the feedback voltage obtained based on the feedback power supply voltage is also relatively high. The voltage conversion chip X1 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 the amplified net input power supply voltage, thereby making the input power supply voltage received by DVDDP lower, so as to reduce power consumption.

[0123] The present invention Figure 5AIn at least one embodiment of the voltage supply circuit shown, when working, 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 is switched from a low-load screen to a high-load screen, the voltage value of the feedback power supply voltage provided by DVDDP_RS will decrease, resulting in a decrease in the potentials of N1 and N2, and returning to the internal summing circuit module of PMIC, the voltage value of the feedback voltage decreases, resulting in an increase in the net input voltage to form a positive feedback, so that the output power supply voltage under the high-load screen is increased, and the input power supply voltage received by DI is also increased; conversely, when switching from a high-load screen to a low-load screen, the voltage value of the feedback power supply voltage provided by DVDDP_RS will increase, resulting in an increase in the potentials of N1 and N2, and returning to the internal summing circuit module of PMIC, the voltage value of the feedback voltage increases, resulting in a decrease in the net input voltage to form a negative feedback, so that the output power supply voltage under the low-load screen is reduced, and the input power supply voltage received by DI is also reduced;

[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 combining 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 may be used for voltage stabilization, and the capacitor unit 50 may include a capacitor device between the circuit board F1 and the driving integrated circuit DI.

[0126] The present invention Figure 5A When at least one embodiment of the voltage supply circuit shown is in operation, 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, divided by R2 and R3 to obtain a feedback voltage Vf, and the feedback voltage is written into FB;

[0127] In the 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 [王莹1] 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 a power management integrated circuit PMIC;

[0129] R1, R2, R3, R4, C1, C2, C3 and the capacitor unit 50 may be disposed in a circuit board F1, and the circuit board F1 may 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 overload degree of the current displayed image, point measurement is performed on the output power supply voltage output by the PMIC and the input power supply voltage received by the DI;

[0131] like Figure 6 As shown, TST1 is the first test point, and TST2 is the second test point;

[0132] The first test point TST1 is set on the connection line between VDDR and L1, and the second test point TST2 is set on the connection line between the capacitor unit 50 and DI;

[0133] TEST1 represents the voltage output by PMIC through the second end of L1 to the input voltage of the first capacitor connected to VDDR on FPC. The voltage drop of the line from PMIC to the first capacitor connected to VDDR on PFC is ignored. It can be considered 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. Ignoring the voltage drop of the last section of the trace, 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] like Figure 8 As shown, when the relevant power supply voltage is provided, whether in a high-load 1×8Checker (chessboard) screen (such as Fig. 7A ), or in the low-load G128 Full White screen (as shown Figure 7B As shown), the first test voltage and the second test voltage are both voltage values ​​corresponding to a high-load screen, and the calculated power consumption is approximately 275.6 mW.

[0136] like Fig. 9 As shown, when the present invention is adopted Figure 6In at least one embodiment shown, when the current display screen is a 1×8 Checker screen, the input power voltage received by DVDDP is the same as that 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 about 100mA to about 80mA. The calculated power consumption is about 244.3mW. After adopting at least one embodiment of the present invention, the power consumption gain of displaying the same screen is about 31.3mW, which is about 12% lower than the power consumption of the related design. The power consumption reduction will be more obvious when displaying a lower overload screen.

[0137] like Fig.10 As shown, the driving 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 a power supply voltage feedback terminal DVDDP_RS for detecting the overload degree 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. This is based on three considerations: the location of the pin of the driver integrated circuit, 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 channel of DVDDP_RS to the shortest to the greatest extent, reduce the interference of the routing impedance on the signal as much as possible, and prevent the signal provided by DVDDP_RS and the signal provided by DVDDP from overlapping during FPC Layout; and 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 described in the 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 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.

[0143] In the voltage providing method described in the embodiment of the present invention, a feedback power supply voltage is provided through the power supply voltage feedback terminal, and the feedback power supply voltage reflects the overload degree of displaying different images. The feedback power supply voltage corresponding to different overload degrees is provided to the feedback control circuit, and the feedback control circuit converts the feedback power supply voltage to obtain the feedback voltage; the conversion circuit subtracts the input voltage from the feedback voltage to obtain the net input power supply voltage, and amplifies the net input power supply voltage to obtain the amplified net input power supply voltage. In the voltage providing method described in the embodiment of the present invention, the input power supply voltage can be adjusted according to the overload degree of the current displayed image (the input power supply voltage is positively correlated with the amplified net input power supply voltage); when the current displayed image corresponds to a high overload degree, the input power supply voltage is controlled to be increased; when the current displayed image corresponds to a low overload 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 level under the premise of ensuring that various IP modules inside the driver integrated circuit can operate normally and the screen can display the picture normally, thereby achieving the purpose of reducing the power consumption of the driver integrated circuit, thereby extending the battery life of the whole machine.

[0144] 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;

[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 invention, the voltage providing circuit further includes a voltage stabilizing circuit; and the voltage providing method further includes:

[0147] 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.

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

[0149] The voltage regulator provides a digital power supply voltage to the voltage output circuit;

[0150] 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.

[0151] The display device described in the embodiment of the present invention comprises a driving integrated circuit and the above-mentioned voltage supply circuit; the driving integrated circuit comprises a power supply voltage feedback terminal;

[0152] The voltage supply circuit includes a feedback control circuit electrically connected to the power supply voltage feedback terminal.

[0153] Optionally, the voltage supply circuit further includes a voltage stabilization circuit, a voltage stabilizer and a voltage output circuit, and the driver integrated circuit further includes a power supply voltage input terminal;

[0154] 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.

[0155] The display device described in at least one embodiment of the present invention further includes a power management integrated circuit; the voltage conversion circuit included in the voltage providing circuit is included in the power management integrated circuit.

[0156] In a specific implementation, the voltage conversion circuit may be included in a power management integrated circuit.

[0157] The display device described in at least one embodiment of the present invention further includes a circuit board;

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

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

[0160] Optionally, the voltage regulator and the voltage output circuit are included in the driver integrated circuit.

[0161] In a specific implementation, the voltage regulator and the voltage output circuit may be included in the driving integrated circuit.

[0162] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A voltage supply circuit, applied to a display device, wherein the display device comprises 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 the 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; 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, characterized in that: When the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases; When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.

3. The voltage supply circuit according to claim 1, characterized in that: 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 for stabilizing the amplified net input power supply voltage.

4. The voltage supply circuit according to claim 3, characterized in that: 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.

5. The voltage supply circuit according to claim 4, characterized in that: The power supply voltage feedback terminal is arranged at a side of the power supply voltage input terminal close to the feedback control circuit.

6. The voltage providing circuit according to any one of claims 1 to 5, characterized in that: 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.

7. The voltage supply circuit according to claim 3, characterized in that: 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.

8. A voltage providing method, applied to the voltage providing circuit according to any one of claims 1 to 7, 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 change of the voltage value of the feedback power supply voltage; 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.

9. The voltage providing method according to claim 8, wherein: When the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases; When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.

10. The voltage providing method according to claim 8, 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 a power supply voltage output terminal.

11. The voltage providing method according to claim 10, wherein: The voltage supply circuit further includes a voltage stabilizer and a voltage output circuit; 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.

12. A display device, characterized in that: It comprises a driving integrated circuit and a voltage supply circuit as claimed in any one of claims 1 to 7; the driving integrated circuit comprises a power supply voltage feedback terminal; The voltage supply circuit includes a feedback control circuit electrically connected to the power supply voltage feedback terminal.

13. The display device according to claim 12, 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.

14. The display device according to claim 12, 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.

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

16. The display device according to claim 13, wherein: The voltage regulator and the voltage output circuit are included in the driving integrated circuit.

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