Voltage supply circuit, voltage supply method and display apparatus
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-01-23
- Publication Date
- 2026-08-13
Smart Images
Figure CN2026074379_13082026_PF_FP_ABST
Abstract
Description
Voltage supply circuit, voltage supply method and display device
[0001] Cross-references to related applications
[0002] This application claims priority to Chinese Patent Application No. 202510134289.4, filed in China on February 6, 2025, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This disclosure relates to the field of display technology, and in particular to a voltage supply circuit, a voltage supply method, and a display device. Background Technology
[0004] During normal screen display, the proper functioning of various IP (intellectual property) algorithm modules within the driver integrated circuit is a prerequisite for normal screen display. To ensure a good user experience, extending the overall battery life, improving battery efficiency, and reducing the power consumption of the driver integrated circuit are all highly beneficial for the entire device.
[0005] In related technologies, the input power supply voltage of the driver integrated circuit contributes to digital power consumption. When the input power supply voltage enters the driver integrated circuit, it is used to operate various IP modules. Essentially, all IP modules are powered by the input power supply voltage, resulting in a significant proportion of power consumption at the input power supply voltage stage, approximately 30% of the overall power consumption of the driver integrated circuit. Furthermore, in these driver integrated circuits, the input power supply voltage is a constant voltage; it does not change regardless of the image displayed on the screen. This requires the input power supply voltage to remain at a high level for extended periods to prevent insufficient input power supply voltage from causing various IP modules to malfunction when displaying complex images, thus affecting the screen display effect. This further contributes to the high power consumption at the input power supply voltage stage. Summary of the Invention
[0006] The main objective of this disclosure is to provide a voltage supply circuit, a voltage supply method, and a display device to solve the problem of high power consumption of driving integrated circuits in the prior art.
[0007] In one aspect, embodiments of this disclosure provide a voltage supply circuit applied to a display device, the display device including 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;
[0008] 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 voltage value of the feedback power supply voltage.
[0009] The voltage conversion circuit is electrically connected to the voltage input terminal and the feedback voltage terminal respectively. It is used to subtract the input voltage provided by the voltage input terminal from the feedback voltage to obtain the net input power supply voltage, and amplify the net input power supply voltage to obtain the amplified net input power supply voltage, which is then provided through the output terminal of the voltage conversion circuit.
[0010] Optionally, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases;
[0011] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.
[0012] The voltage supply circuit described in at least one embodiment of this disclosure further includes a voltage regulator circuit; the output terminal of the voltage conversion circuit is electrically connected to the power supply voltage output terminal; the power supply voltage output terminal is used to provide an output power supply voltage.
[0013] The voltage regulator circuit is electrically connected to the output terminal of the voltage conversion circuit and is used to regulate the amplified net input power supply voltage.
[0014] The voltage supply circuit described in at least one embodiment of this disclosure further includes a voltage regulator and a voltage output circuit; the driver integrated circuit further includes a power supply voltage input terminal;
[0015] The voltage regulator is electrically connected to the voltage output circuit and is used to provide digital power supply voltage to the voltage output circuit.
[0016] The voltage output circuit is also electrically connected to the power supply voltage output terminal, for receiving the output power supply voltage, generating an input power supply voltage based on 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.
[0017] Optionally, the power supply voltage feedback terminal is located on the side of the power supply voltage input terminal close to the feedback control circuit.
[0018] Optionally, the feedback control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor;
[0019] The first end of the first resistor is electrically connected to the power supply voltage feedback terminal, and the second end of the first resistor is electrically connected to the first node;
[0020] 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 the second node;
[0021] 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 the DC voltage terminal; the second node is electrically connected to the feedback voltage terminal.
[0022] The first end of the fourth resistor is electrically connected to the power supply voltage output terminal, and the second end of the fourth resistor is electrically connected to the first node;
[0023] 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.
[0024] Optionally, the voltage regulator circuit includes at least one voltage regulator capacitor;
[0025] The first end of the voltage regulator capacitor is electrically connected to the power supply voltage output terminal, and the second end of the voltage regulator capacitor is electrically connected to the ground terminal.
[0026] In a second aspect, embodiments of this disclosure provide a voltage providing method applied to the aforementioned voltage providing circuit, the voltage providing method comprising:
[0027] The feedback control circuit converts the feedback power supply voltage provided by the power supply voltage feedback terminal to obtain a feedback voltage that is provided through the feedback voltage terminal; the voltage value of the feedback voltage changes with the voltage value of the feedback power supply voltage.
[0028] The voltage conversion circuit subtracts the feedback voltage from the input voltage provided by the voltage input terminal 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 provided through the output terminal of the voltage conversion circuit.
[0029] Optionally, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases;
[0030] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.
[0031] Optionally, the voltage providing circuit further includes a voltage regulating circuit; the voltage providing method further includes:
[0032] The voltage regulator circuit regulates the amplified net input power supply voltage and obtains the output power supply voltage, which is then provided through the power supply voltage output terminal.
[0033] Optionally, the voltage providing circuit further includes a voltage regulator and a voltage output circuit; the voltage providing method further includes:
[0034] The voltage regulator provides a digital power supply voltage to the voltage output circuit;
[0035] The voltage output circuit receives the output power supply voltage, generates an input power supply voltage based on the output power supply voltage and the digital power supply voltage, and provides the input power supply voltage to the power supply voltage input terminal.
[0036] In a third aspect, embodiments of this disclosure provide a display device, including a driver integrated circuit and the voltage supply circuit described above; the driver integrated circuit includes a power supply voltage feedback terminal;
[0037] The voltage supply circuit includes a feedback control circuit that is electrically connected to the power supply voltage feedback terminal.
[0038] Optionally, the voltage supply circuit further includes a voltage regulator circuit, a voltage regulator and a voltage output circuit, and the driver integrated circuit further includes a power supply voltage input terminal;
[0039] The voltage output circuit is electrically connected to the power supply voltage input terminal and is used to provide the power supply voltage input terminal with the input power supply voltage.
[0040] The display device described in at least one embodiment of this disclosure further includes a power management integrated circuit; the voltage supply circuit includes a voltage conversion circuit contained within the power management integrated circuit.
[0041] The display device described in at least one embodiment of this disclosure further includes a circuit board;
[0042] The feedback control circuit and the voltage regulator circuit are mounted on the circuit board.
[0043] Optionally, the voltage regulator and the voltage output circuit are included in the driver integrated circuit.
[0044] The voltage supply circuit, voltage supply method, and display device described in this disclosure provide a feedback power supply voltage by adding a power supply voltage feedback terminal. This feedback power supply voltage reflects the load level of displaying different images. Feedback power supply voltages corresponding to different load levels are provided to a feedback control circuit, which converts the feedback power supply voltage to obtain a feedback voltage. The conversion circuit subtracts the feedback voltage from the input 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 described in this disclosure can adjust the input power supply voltage (which is positively correlated with the amplified net input power supply voltage) according to the load level of the currently displayed image. 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 the normal operation of various IP modules within the driver integrated circuit and normal screen display, thereby reducing the power consumption of the driver integrated circuit and extending the overall battery life. Attached Figure Description
[0045] Figure 1 is a structural diagram of the voltage supply circuit according to an embodiment of the present disclosure;
[0046] Figure 2 is a structural diagram of the voltage supply circuit according to an embodiment of the present disclosure;
[0047] Figure 3 is a structural diagram of the voltage supply circuit according to an embodiment of this disclosure;
[0048] Figure 4 is a structural diagram of the voltage supply circuit according to an embodiment of this disclosure;
[0049] Figure 5A is a circuit diagram of the voltage supply circuit according to an embodiment of this disclosure;
[0050] Figure 5B is a circuit diagram of the voltage supply circuit according to an embodiment of this disclosure;
[0051] Figure 6 is a circuit diagram of the voltage supply circuit according to an embodiment of this disclosure;
[0052] Figure 7A is a schematic diagram of the 8 Checker (chessboard) screen;
[0053] Figure 7B is a schematic diagram of the G128 Full White screen;
[0054] Figure 8 is a schematic diagram of the first and second test voltages under the 1×8 Checker screen and the G128 Full White screen when the relevant power supply voltage supply scheme is adopted.
[0055] Figure 9 is a schematic diagram of the first test voltage and the second test voltage under a 1×8 Checker screen and a G128 Full White screen when at least one embodiment shown in Figure 6 of this disclosure is used;
[0056] Figure 10 is a structural diagram of at least one embodiment of a driver integrated circuit. Detailed Implementation
[0057] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.
[0058] In all embodiments of this disclosure, the transistors used can be thin-film transistors, field-effect transistors, or other devices with similar characteristics. In the embodiments of this disclosure, to distinguish the two terminals of the transistor other than the gate, one terminal is referred to as the first terminal and the other as the second terminal.
[0059] In actual operation, when the transistor is a thin-film transistor or a field-effect transistor, the first electrode can be the drain and the second electrode can be the source; or, the first electrode can be the source and the second electrode can be the drain.
[0060] The voltage supply circuit described in this embodiment is applied to a display device, which includes a driver integrated circuit. As shown in FIG1, the voltage supply circuit includes a feedback control circuit 11 and a voltage conversion circuit 12. The driver integrated circuit includes a power supply voltage feedback terminal DVDDP_RS.
[0061] 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 a feedback voltage provided through the feedback voltage terminal FB; the voltage value of the feedback voltage changes with the voltage value of the feedback power supply voltage.
[0062] The voltage conversion circuit 12 is electrically connected to the voltage input terminal I1 and the feedback voltage terminal FB, respectively. It is used to subtract the input voltage provided by the voltage input terminal I1 from the feedback voltage to obtain the net input power supply voltage, and amplify the net input power supply voltage to obtain the amplified net input power supply voltage provided through the output terminal of the voltage conversion circuit 12.
[0063] This disclosure provides a voltage supply circuit that provides a feedback power supply voltage by adding a power supply voltage feedback terminal DVDDP_RS. This feedback power supply voltage reflects the load level of different displayed images. Feedback power supply voltages corresponding to different load levels are provided to a feedback control circuit 11, which converts the feedback power supply voltage to obtain a feedback voltage. A voltage conversion circuit 12 subtracts the feedback voltage from the input 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 described in this disclosure can adjust the input power supply voltage (which is positively correlated with the amplified net input power supply voltage) according to the load level of the currently displayed image. 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 the normal operation of various IP modules within the driver integrated circuit and normal screen display, thereby reducing the power consumption of the driver integrated circuit and extending the overall battery life.
[0064] In at least one embodiment of this disclosure, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases;
[0065] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.
[0066] As shown in Figure 2, at least one embodiment of the voltage conversion circuit may include a summing circuit 21 and an amplifier circuit 22;
[0067] 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 the net input power supply voltage Vi'.
[0068] The amplifier circuit 22 is used to amplify the net input power supply voltage Vi', and obtain the amplified net input power supply voltage, which is then provided through the power supply voltage output terminal VDDR.
[0069] In at least one embodiment shown in Figure 2, when in operation, Vi' = Vi - Vf;
[0070] A=Vddr / Vi', F=Vf / Vddr, Af=Vddr / Vi;
[0071] Vddr=A×Vi'=A×(Vi-Vf)=A×(Vi-F×Vddr);
[0072] Af = Vddr / Vi = A / (1+A×F);
[0073] Where Vddr is the potential of VDDR, A is the open-loop gain, F is the feedback coefficient, Af is the closed-loop gain, and 1+A×F is the feedback depth.
[0074] When |1+A×F|>1, |Af|<|A|, it is negative feedback; Vddr will decrease.
[0075] When |1+A×F|<1, |Af|>|A|, which is positive feedback; Vddr will increase.
[0076] As shown in Figure 3, based on at least one embodiment shown in Figure 1, the voltage supply circuit of at least one embodiment of this disclosure further includes a voltage regulator circuit 31; the output terminal of the voltage conversion circuit 12 is electrically connected to the power supply voltage output terminal VDDR; the power supply voltage output terminal VDDR is used to provide the output power supply voltage;
[0077] The voltage regulator circuit 31 is electrically connected to the output terminal of the voltage conversion circuit 12, and is used to regulate the amplified net input power supply voltage.
[0078] As shown in Figure 4, based on at least one embodiment shown in Figure 3, the voltage supply circuit of at least one embodiment of this disclosure further includes a voltage regulator LD and a voltage output circuit VOT; the driver integrated circuit further includes a power supply voltage input terminal DVDDP;
[0079] The voltage regulator LD is electrically connected to the voltage output circuit VOT and is used to provide the digital power supply voltage DVDD to the voltage output circuit VOT.
[0080] 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 the 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.
[0081] In at least one embodiment of this disclosure, the voltage regulator can be an LDO (low dropout regulator). The PMIC (power management integrated circuit) identifies the voltage value and 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 input power supply voltage can be dynamically adjusted by the feedback power supply voltage provided by the power supply voltage feedback terminal DVDDP_RS, thereby reducing the digital power consumption and proportion of the driver circuit DVDDP.
[0082] In practical implementation, the voltage regulator LD and the voltage output circuit VOT can be integrated into the driver integrated circuit.
[0083] Optionally, the feedback control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor;
[0084] The first end of the first resistor is electrically connected to the power supply voltage feedback terminal, and the second end of the first resistor is electrically connected to the first node;
[0085] 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 the second node;
[0086] 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 the DC voltage terminal; the second node is electrically connected to the feedback voltage terminal.
[0087] The first end of the fourth resistor is electrically connected to the power supply voltage output terminal, and the second end of the fourth resistor is electrically connected to the first node;
[0088] 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.
[0089] Optionally, the DC voltage terminal can be a ground terminal or a low voltage terminal, but is not limited thereto.
[0090] Optionally, the voltage regulator circuit includes at least one voltage regulator capacitor;
[0091] The first end of the voltage regulator capacitor is electrically connected to the power supply voltage output terminal, and the second end of the voltage regulator capacitor is electrically connected to the ground terminal.
[0092] As shown in Figure 5A, based on at least one embodiment shown in Figure 3, the voltage conversion circuit may include a voltage conversion chip X1 and a first inductor L1;
[0093] 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 driver 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.
[0094] The first end of the first resistor R1 is electrically connected to the feedback voltage terminal VDDR_RS, and the second end of the first resistor R1 is electrically connected to the first node N1.
[0095] The first end of the second resistor R2 is electrically connected to the first node N1, and the second end of the second resistor R2 is electrically connected to the second node N2.
[0096] 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 terminal; the second node N2 is electrically connected to the feedback voltage terminal FB.
[0097] The first end of the fourth resistor R4 is electrically connected to the power supply voltage output terminal VDDR, and the second end of the fourth resistor R4 is electrically connected to the first node N1.
[0098] The first terminal of the first capacitor C1 is electrically connected to the first node N1, and the second terminal of the first capacitor C1 is electrically connected to the second node N2.
[0099] 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 that are electrically connected.
[0100] The input terminal VIN is electrically connected to the voltage input terminal I1, and the enable terminal EN is electrically connected to the enable signal terminal E1, with E1 providing an enable signal for EN; the voltage input terminal I1 is used to provide the input voltage.
[0101] The first terminal of L1 is electrically connected to the output terminal LX1, and the second terminal of L1 is electrically connected to the power supply voltage output terminal VDDR.
[0102] The voltage regulator circuit includes a second capacitor C2 and a third capacitor C3;
[0103] The first terminal of C2 is electrically connected to the power supply voltage output terminal VDDR, and the second terminal of C2 is electrically connected to the ground terminal.
[0104] The first terminal of C3 is electrically connected to the power supply voltage output terminal VDDR, and the second terminal of C3 is electrically connected to the ground terminal.
[0105] The voltage supply circuit described in at least one embodiment of this disclosure may further include a fifth resistor R5 and a fourth capacitor C4;
[0106] The first terminal of R5 is electrically connected to E1, and the second terminal of R5 is electrically connected to ground.
[0107] The first terminal of C4 is electrically connected to I1, and the second terminal of C4 is electrically connected to ground.
[0108] 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 driver integrated circuit DI.
[0109] The power supply voltage output terminal VDDR is electrically connected to the voltage output circuit VOT through capacitor unit 50;
[0110] The voltage regulator LD is electrically connected to the voltage output circuit VOT and is used to provide the digital power supply voltage DVDD to the voltage output circuit VOT.
[0111] 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 based on 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.
[0112] In at least one embodiment shown in Figure 5A, the DC voltage terminal is the ground terminal.
[0113] In at least one embodiment shown in Figure 5A, the output power supply voltage provided by VDDR is positively correlated with the input power supply voltage received by the power supply voltage input terminal DVDDP. That is, when the output power supply voltage increases, the input power supply voltage increases; when the output power supply voltage decreases, the input power supply voltage decreases.
[0114] In at least one embodiment shown in FIG5A, the second pin labeled PG is X1, and the capacitor unit 50 may include a plurality of capacitors.
[0115] In at least one embodiment shown in Figure 5A, X1 and L1 can be integrated into the PMIC, and R1, R2, R3, R4, C1, C2 and C3 can all be disposed on the FPC (flexible printed circuit board). X1 is the summing circuit module inside the PMIC.
[0116] At least one embodiment of the voltage supply circuit shown in Figure 5A of this disclosure, when in operation,
[0117] DVDDP_RS provides feedback power supply voltage to the feedback voltage terminal VDDR_RS. The feedback power supply voltage is written to N1 through R1, divided by R2 and R3 to obtain the feedback voltage Vf, and then written to FB.
[0118] The voltage conversion chip X1 is used to subtract the input voltage from the feedback voltage received by the feedback voltage terminal FB to obtain the 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 LX1.
[0119] The amplified net input power supply voltage is regulated by C2 and C3 to obtain the output power supply voltage, which is then provided through the power supply voltage output terminal VDDR.
[0120] In at least one embodiment of the voltage supply circuit shown in FIG5A of this disclosure, the voltage value of the feedback voltage increases when the voltage value of the feedback power supply voltage increases.
[0121] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.
[0122] At least one embodiment of the voltage supply circuit shown in Figure 5A of this disclosure, when in operation,
[0123] When the current display image is under heavy load, the voltage value of the feedback power supply voltage provided by DVDDP_RS is low, and the voltage value of the feedback voltage obtained based on the feedback power supply voltage is also low. The voltage conversion chip X1 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, thereby making the input power supply voltage received by DVDDP higher, so as to meet the requirements of high heavy load display images.
[0124] When the current display image has a low load level, the feedback power supply voltage provided by DVDDP_RS is relatively high, and 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 the 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.
[0125] In at least one embodiment of the voltage supply circuit shown in Figure 5A of this disclosure, 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-load screen to a high-load screen, the voltage value 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 inside the PMIC, the decrease in the voltage value of the feedback voltage leads to an increase in the net input voltage, forming positive feedback. This results in an increase in the output power supply voltage under the high-load screen, and the input power supply voltage received by DI also increases. 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 increases, causing the potentials of N1 and N2 to increase. Returning to the summing circuit module inside the PMIC, the increase in the voltage value of the feedback voltage leads to a decrease in the net input voltage, forming negative feedback. This results in a decrease in the output power supply voltage under the low-load screen, and the input power supply voltage received by DI also decreases.
[0126] At least one embodiment of the voltage supply circuit shown in Figure 5A of this disclosure, when in operation, results in lower digital power consumption for the driver integrated circuit DI due to the combined dynamic changes in the input power supply voltage.
[0127] In at least one embodiment of the voltage supply circuit shown in FIG5A of this disclosure, the first inductor L1 can be used for voltage regulation, and the capacitor unit 50 can include a capacitor between the circuit board F1 and the driver integrated circuit DI.
[0128] In at least one embodiment of the voltage supply circuit shown in Figure 5A of this disclosure, 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 through R1, divided by R2 and R3 to obtain the feedback voltage Vf, and then written to FB.
[0129] In practical implementation, since the operating voltage range of the driver integrated circuit DI is different from that 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, so as to meet the operating voltage range of the voltage conversion chip X1.
[0130] As shown in Figure 5B, X1, C4, R5, and L1 can be configured in the power management integrated circuit (PMIC).
[0131] R1, R2, R3, R4, C1, C2, C3 and capacitor unit 50 can be disposed in circuit board F1, which can be a flexible circuit board.
[0132] To verify the effectiveness of the technical solution of dynamically adjusting the input power supply voltage according to the current display image load level, point-selected measurements were performed on the output power supply voltage of the PMIC and the input power supply voltage received by the DI.
[0133] As shown in Figure 6, TST1 is the first test point and TST2 is the second test point;
[0134] 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 capacitor unit 50 and DI.
[0135] TEST1 represents the input voltage of the first capacitor connected to VDDR on the FPC, which is output from the second terminal of L1 by the PMIC. Ignoring the wiring and voltage drop between the PMIC and the first capacitor connected to VDDR on the PFC, it can be assumed that the first test voltage on TEST1 is equal to the voltage provided by LX1.
[0136] 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 trace, it can be assumed that the second test voltage on TEST2 is equal to the voltage received by the voltage output circuit VOT in DI.
[0137] As shown in Figure 8, when using the relevant power supply voltage solution, whether under the high-load 1×8 Checker screen (as shown in Figure 7A) or the low-load G128 Full White screen (as shown in Figure 7B), the first test voltage and the second test voltage are the voltage values corresponding to the high-load screen, and the calculated power consumption is approximately 275.6mW.
[0138] As shown in Figure 9, when using at least one embodiment shown in Figure 6 of this disclosure, the input power supply voltage received by DVDDP is the same as in related technologies when the current display screen is a 1×8 Checker screen. 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 reduced from about 100mA to about 80mA. The calculated power consumption is about 244.3mW. After using at least one embodiment of this disclosure, the power consumption gain for displaying the same screen is about 31.3mW, which is about 12% lower than the power consumption of related designs. The power consumption reduction will be more significant when displaying lower load screens.
[0139] As shown in Figure 10, 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 disposed on the side of each power supply voltage input terminal close to the feedback control circuit;
[0140] The outermost pin is used as the power supply voltage feedback terminal DVDDP_RS to detect the heavy load of the screen display image.
[0141] In at least one embodiment of this disclosure, the outermost path is selected as the power supply voltage feedback terminal DVDDP_RS. This is based on three considerations: the pin location of the driver integrated circuit, the ease of layout, and the Hi_z (high impedance state) feedback signal. Using the outermost pin as the power supply voltage feedback terminal DVDDP_RS can minimize the channel length of DVDDP_RS, reduce the interference of trace impedance on the signal as much as possible, and prevent the signal provided by DVDDP_RS and DVDDP from overlapping during FPC layout. Furthermore, the outermost pin is the easiest to implement Hi_Z high impedance state signal processing, which can prevent external signal backflow from causing interference.
[0142] The voltage providing method described in this embodiment is applied to the voltage providing circuit described above, and the voltage providing method includes:
[0143] The feedback control circuit converts the feedback power supply voltage provided by the power supply voltage feedback terminal to obtain a feedback voltage that is provided through the feedback voltage terminal; the voltage value of the feedback voltage changes with the voltage value of the feedback power supply voltage.
[0144] The voltage conversion circuit subtracts the feedback voltage from the input voltage provided by the voltage input terminal 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 provided through the output terminal of the voltage conversion circuit.
[0145] In the voltage supply method described in this embodiment, a feedback power supply voltage is provided through a power supply voltage feedback terminal. This feedback power supply voltage reflects the load level of displaying different images. Feedback power supply voltages corresponding to different load levels are provided to a feedback control circuit. The feedback control circuit converts the feedback power supply voltage to obtain a feedback voltage. The conversion circuit subtracts the feedback voltage from the input 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 supply method described in this embodiment, the input power supply voltage can be adjusted 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 controlled to increase; when the currently displayed image corresponds to a low load level, the input power supply voltage is controlled to decrease. This ensures that the input power supply voltage is adjusted to the lowest possible level while maintaining the normal operation of various IP modules within the driver integrated circuit and the normal display of the screen, thereby reducing the power consumption of the driver integrated circuit and extending the battery life of the entire device.
[0146] In at least one embodiment of this disclosure, when the voltage value of the feedback power supply voltage increases, the voltage value of the feedback voltage increases;
[0147] When the voltage value of the feedback power supply voltage decreases, the voltage value of the feedback voltage decreases.
[0148] In at least one embodiment of this disclosure, the voltage providing circuit further includes a voltage regulating circuit; the voltage providing method further includes:
[0149] The voltage regulator circuit regulates the amplified net input power supply voltage and obtains the output power supply voltage, which is then provided through the power supply voltage output terminal.
[0150] Optionally, the voltage providing circuit further includes a voltage regulator and a voltage output circuit; the voltage providing method further includes:
[0151] The voltage regulator provides a digital power supply voltage to the voltage output circuit;
[0152] The voltage output circuit receives the output power supply voltage, generates an input power supply voltage based on the output power supply voltage and the digital power supply voltage, and provides the input power supply voltage to the power supply voltage input terminal.
[0153] The display device described in this embodiment includes a driver integrated circuit and the voltage supply circuit described above; the driver integrated circuit includes a power supply voltage feedback terminal;
[0154] The voltage supply circuit includes a feedback control circuit that is electrically connected to the power supply voltage feedback terminal.
[0155] Optionally, the voltage supply circuit further includes a voltage regulator circuit, a voltage regulator and a voltage output circuit, and the driver integrated circuit further includes a power supply voltage input terminal;
[0156] The voltage output circuit is electrically connected to the power supply voltage input terminal and is used to provide the power supply voltage input terminal with the input power supply voltage.
[0157] The display device described in at least one embodiment of this disclosure further includes a power management integrated circuit; the voltage supply circuit includes a voltage conversion circuit contained within the power management integrated circuit.
[0158] In practice, the voltage conversion circuit can be included in a power management integrated circuit.
[0159] The display device described in at least one embodiment of this disclosure further includes a circuit board;
[0160] The feedback control circuit and the voltage regulator circuit are mounted on the circuit board.
[0161] In a practical implementation, the feedback control circuit and the voltage regulator circuit can be mounted on a circuit board, such as an FPC.
[0162] Optionally, the voltage regulator and the voltage output circuit are included in the driver integrated circuit.
[0163] In a specific implementation, the voltage regulator and the voltage output circuit may be included in the driver integrated circuit.
[0164] The above description represents the preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles described herein, and these improvements and modifications should also be considered within the scope of protection of this disclosure.
Claims
1. A voltage supply circuit applied to a display device, the display device including a driver integrated circuit; the voltage supply circuit including a feedback control circuit and a voltage conversion circuit; the driver integrated circuit including 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 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. It is used to subtract the input voltage provided by the voltage input terminal from the feedback voltage to obtain the net input power supply voltage, and amplify the net input power supply voltage to obtain the amplified net input power supply voltage, which is then provided through the output terminal of the voltage conversion circuit.
2. The voltage supply circuit as described in claim 1, wherein, When the voltage value of the feedback power supply 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 as described in claim 1, wherein, It also includes a voltage regulator circuit; the output terminal of the voltage conversion circuit is electrically connected to the power supply voltage output terminal; the power supply voltage output terminal is used to provide the output power supply voltage. The voltage regulator circuit is electrically connected to the output terminal of the voltage conversion circuit and is used to regulate the amplified net input power supply voltage.
4. The voltage supply circuit as described in claim 3, wherein, It also includes a voltage regulator and a voltage output circuit; the driver integrated circuit also includes a power supply voltage input terminal; The voltage regulator is electrically connected to the voltage output circuit and is used to provide digital power supply voltage to the voltage output circuit. The voltage output circuit is also electrically connected to the power supply voltage output terminal, for receiving the output power supply voltage, generating an input power supply voltage based on 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.
5. The voltage supply circuit as described in claim 4, wherein, The power supply voltage feedback terminal is located on the side of the power supply voltage input terminal close to the feedback control circuit.
6. The voltage supply circuit according to any one of claims 1 to 5, wherein, The feedback control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor; The first end of the first resistor is electrically connected to the power supply voltage feedback terminal, and the second end of the first resistor is electrically connected to the first node; 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 the second node; 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 the DC voltage terminal; the second node is electrically connected to the feedback voltage terminal. The first end of the fourth resistor is electrically connected to the power supply voltage output terminal, and the second end of the fourth resistor is electrically connected to the first node; 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.
7. The voltage supply circuit as described in claim 3, wherein, The voltage regulator circuit includes at least one voltage regulator capacitor; The first end of the voltage regulator capacitor is electrically connected to the power supply voltage output terminal, and the second end of the voltage regulator capacitor is electrically connected to the ground terminal.
8. A voltage supply method, applied to a voltage supply circuit as described in any one of claims 1 to 7, the voltage supply method comprising: The feedback control circuit converts the feedback power supply voltage provided by the power supply voltage feedback terminal to obtain the feedback voltage provided through the feedback voltage terminal; The voltage value of the feedback voltage changes with the voltage value of the feedback power supply voltage; The voltage conversion circuit subtracts the feedback voltage from the input voltage provided by the voltage input terminal 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 provided through the output terminal of the voltage conversion circuit.
9. The voltage supply method as described in claim 8, wherein, When the voltage value of the feedback power supply 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 supply method as claimed in claim 8, wherein, The voltage providing circuit further includes a voltage regulating circuit; the voltage providing method further includes: The voltage regulator circuit regulates the amplified net input power supply voltage and obtains the output power supply voltage, which is then provided through the power supply voltage output terminal.
11. The voltage supply method as claimed in claim 10, wherein, The voltage supply circuit further includes a voltage regulator 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 supply voltage, generates an input power supply voltage based on the output power supply voltage and the digital power supply voltage, and provides the input power supply voltage to the power supply voltage input terminal.
12. A display device, comprising a driver integrated circuit and a voltage supply circuit as claimed in any one of claims 1 to 7; the driver integrated circuit includes a power supply voltage feedback terminal; The voltage supply circuit includes a feedback control circuit that is electrically connected to the power supply voltage feedback terminal.
13. The display device as claimed in claim 12, wherein, The voltage supply circuit further includes a voltage regulator circuit, a voltage regulator and a voltage output circuit, and the driver 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 the power supply voltage input terminal with the input power supply voltage.
14. The display device as claimed in claim 12, wherein, It also includes a power management integrated circuit; the voltage supply circuit includes a voltage conversion circuit contained within the power management integrated circuit.
15. The display device as claimed in claim 13, wherein, It also includes circuit boards; The feedback control circuit and the voltage regulator circuit are mounted on the circuit board.
16. The display device as claimed in claim 13, wherein, The voltage regulator and the voltage output circuit are included in the driver integrated circuit.