CN111161692B

CN111161692B - Power supply voltage compensation circuit, method, integrated power supply management circuit and display device

Info

Publication number: CN111161692B
Application number: CN202010098774.8A
Authority: CN
Inventors: 乔玄玄; 汪敏; 王建军; 刘帅; 袁先锋; 陈泽君; 刘媛媛; 刘晓石; 王凯文
Original assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Priority date: 2020-02-18
Filing date: 2020-02-18
Publication date: 2022-04-22
Anticipated expiration: 2040-02-18
Also published as: CN111161692A

Abstract

The invention provides a power supply voltage compensation circuit, a power supply voltage compensation method, an integrated power supply management circuit and a display device, relates to the technical field of display, and aims to solve the problem that when a display product is high in refreshing frequency, ripple waves of power supply voltage in the display product are increased, and therefore display quality of the display product is affected. The power supply voltage compensation method comprises the following steps: periodically collecting a current signal at a power supply voltage output end, wherein the power supply voltage output end is electrically connected with a driving chip in a display panel; according to the magnitude of the current signal, determining compensation control information corresponding to the current signal from a preset lookup table; the lookup table comprises corresponding relations between different current signals and compensation control information; controlling a corresponding target compensation unit in the plurality of compensation units to access the compensation circuit access end according to the compensation control information; and according to the target compensation unit, periodically adjusting the power supply voltage output by the power supply voltage output end. The power supply voltage compensation method provided by the invention is used for compensating the power supply voltage.

Description

Power supply voltage compensation circuit, method, integrated power supply management circuit and display device

Technical Field

The invention relates to the technical field of display, in particular to a power supply voltage compensation circuit, a method, an integrated power supply management circuit and a display device.

Background

With the continuous development of display technology, the refresh rate of display products is also continuously improved, but with the improvement of the refresh rate, the power consumption of the display products is also increased, so that the ripple of the power supply voltage in the display products is increased, and the display quality of the display products is affected.

Disclosure of Invention

The invention aims to provide a power supply voltage compensation circuit, a power supply voltage compensation method, an integrated power supply management circuit and a display device, which are used for solving the problem that when a display product is high in refreshing frequency, ripple waves of power supply voltage in the display product are increased, so that the display quality of the display product is influenced.

In order to achieve the above purpose, the invention provides the following technical scheme:

a first aspect of the present invention provides a power supply voltage compensation method, applied to an integrated power supply management circuit applied to a display panel, the integrated power supply management circuit including a plurality of compensation units, a power supply voltage output terminal, and a compensation circuit access terminal, the power supply voltage compensation method including:

periodically collecting a current signal at a power supply voltage output end, wherein the power supply voltage output end is electrically connected with a driving chip in the display panel;

according to the magnitude of the current signal, determining compensation control information corresponding to the current signal from a preset lookup table; the lookup table comprises corresponding relations between different current signals and compensation control information;

controlling a corresponding target compensation unit in the plurality of compensation units to be accessed to the compensation circuit access end according to the compensation control information;

and according to the target compensation unit, periodically adjusting the power supply voltage output by the power supply voltage output end.

Optionally, the power supply voltage compensation method further includes:

before periodically collecting a current signal of a power supply voltage output end, judging whether the current signal of the power supply voltage output end is collected or not, and generating a corresponding judgment result;

when the judgment result indicates that the current signal of the power supply voltage output end is not acquired, controlling a preset compensation unit in the plurality of compensation units to be connected to the compensation circuit access end;

and adjusting the power supply voltage output by the power supply voltage output end according to the preset compensation unit.

Optionally, the step of judging whether to acquire the current signal of the power supply voltage output end and generating a corresponding judgment result specifically includes:

and judging whether the refresh frequency of the display panel changes or not, if so, indicating to collect the current signal of the power supply voltage output end by the judgment result, and if not, indicating not to collect the current signal of the power supply voltage output end by the judgment result.

Optionally, the power supply voltage compensation method further includes:

generating a first and a second periodic timing control signal;

the step of periodically acquiring the current signal at the voltage output end of the power supply specifically comprises the following steps:

periodically collecting a current signal of a power supply voltage output end according to the first time sequence control signal;

the step of periodically adjusting the power supply voltage output by the power supply voltage output terminal according to the target compensation unit specifically includes:

and under the control of the second time sequence control signal, periodically adjusting the power supply voltage output by the power supply voltage output end according to the target compensation unit.

Optionally, the plurality of compensation units include: the first main branch switch, the second main branch switch, the first branch switch, the second branch switch, the third branch switch, the fourth branch switch, the first compensation unit, the second compensation unit, the third compensation unit and the fourth compensation unit;

the first compensation unit is coupled with the compensation circuit access end sequentially through the first branch switch and the first main switch; the second compensation unit is coupled with the compensation circuit access end through the second branch switch and the first main switch in sequence; the third compensation unit is coupled with the compensation circuit access end through the third branch switch and the second main switch in sequence; the fourth compensation unit is coupled with the compensation circuit access end through the fourth branch switch and the second main switch in sequence;

the step of controlling, according to the compensation control information, a corresponding target compensation unit of the plurality of compensation units to access the compensation circuit access end specifically includes:

and according to the compensation control information, controlling a target main circuit switch and a target branch circuit switch which are sequentially coupled by a target compensation unit in the first compensation unit, the second compensation unit, the third compensation unit and the fourth compensation unit to be closed, and controlling a non-target main circuit switch and a non-target branch circuit switch to be disconnected.

Based on the technical solution of the power supply voltage compensation method, a second aspect of the present invention provides a power supply voltage compensation circuit, which is applied to an integrated power supply management circuit, where the integrated power supply management circuit is applied to a display panel, the integrated power supply management circuit includes a plurality of compensation units, a power supply voltage output terminal, and a compensation circuit access terminal, and the power supply voltage compensation circuit includes:

the current sampling module is used for periodically collecting a current signal at a power supply voltage output end, and the power supply voltage output end is electrically connected with a driving chip in the display panel;

the search module is used for determining compensation control information corresponding to the current signal from a preset search table according to the magnitude of the current signal; the lookup table comprises corresponding relations between different current signals and compensation control information;

the compensation control module is used for controlling a corresponding target compensation unit in the plurality of compensation units to be accessed to the compensation circuit access end according to the compensation control information;

and the voltage adjusting module is used for periodically adjusting the power supply voltage output by the power supply voltage output end according to the target compensation unit.

Optionally, the power supply voltage compensation circuit includes:

the compensation judging module is used for judging whether to collect the current signal of the power supply voltage output end before periodically collecting the current signal of the power supply voltage output end and generating a corresponding judging result;

the compensation control module is further configured to control a preset compensation unit of the plurality of compensation units to be connected to the compensation circuit connection end when the judgment result indicates that the current signal of the power supply voltage output end is not collected;

the voltage adjusting module is further configured to adjust the power supply voltage output by the power supply voltage output end according to the preset compensation unit.

Optionally, the compensation determining module is specifically configured to:

and judging whether the refresh frequency of the display panel changes or not, if so, indicating the generated judgment result to collect the current signal of the power supply voltage output end, and if not, indicating the generated judgment result not to collect the current signal of the power supply voltage output end.

Optionally, the power supply voltage compensation circuit further includes:

the time sequence control module is used for generating a first time sequence control signal and a second time sequence control signal which are periodic;

the current sampling module is specifically used for periodically collecting a current signal at a power supply voltage output end according to the first timing control signal;

the voltage adjusting module is specifically configured to periodically adjust the power supply voltage output by the power supply voltage output terminal according to the target compensation unit under the control of the second timing control signal.

the compensation control module is specifically configured to control, according to the compensation control information, a target main switch and a target branch switch, which are sequentially coupled to a target compensation unit of the first compensation unit, the second compensation unit, the third compensation unit, and the fourth compensation unit, to be closed, and control a non-target main switch and a non-target branch switch to be opened.

Optionally, each compensation unit includes a resistor structure and a capacitor structure connected in series, and different resistance values of the resistor structures included in the compensation units are different, and/or different capacitance values of the capacitor structures included in the compensation units are different.

Based on the technical solution of the power supply voltage compensation circuit, a third aspect of the present invention provides an integrated power supply management circuit, including the power supply voltage compensation circuit.

Based on the technical solution of the integrated power management circuit, a fourth aspect of the invention provides a display device, which includes the integrated power management circuit.

Based on the technical solution of the power supply voltage compensation method, a fifth aspect of the present invention provides a power supply voltage compensation circuit, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the power supply voltage compensation method when executing the computer program.

According to the technical scheme provided by the invention, the current signal of the power supply voltage output end can be periodically acquired, and the corresponding target compensation unit is accessed to the compensation circuit access end according to the current signal, so that the power supply voltage output by the power supply voltage output end can be periodically adjusted according to the target compensation unit; therefore, according to the technical scheme provided by the invention, the ripple condition of the power supply voltage in different time periods can be compensated adaptively, so that the power supply voltage output by the integrated power supply management circuit in different time periods has lower ripple, and the display product can realize good display quality when the power supply voltage is provided for the display product.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a first flowchart of a power supply voltage compensation method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a RT6819 connection provided in an embodiment of the present invention;

FIG. 3 is a schematic diagram showing the presence of black blocks on the distal side of the display panel;

FIG. 4 is a schematic diagram illustrating a normal display of the display panel;

FIG. 5 is a schematic diagram of a display panel with cross talk;

FIG. 6 is a second flowchart of a power supply voltage compensation method according to an embodiment of the present invention;

FIG. 7 is a third flowchart of a power supply voltage compensation method according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a compensation unit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a power supply voltage compensation circuit according to an embodiment of the present invention;

FIG. 10 is a diagram illustrating a comparison of partial signals in the first display panel and the second display panel;

fig. 11 is a schematic diagram comparing signals corresponding to S-outputs in the first display panel and the second display panel.

Detailed Description

In order to further explain the power supply voltage compensation circuit, method, integrated power management circuit, and display device provided by the embodiments of the present invention, the following detailed description is made with reference to the accompanying drawings.

Based on the problems of the background art, the inventors of the present invention have studied and found that, in order to reduce the ripple voltage of the power supply voltage in the display product, the power supply voltage can be compensated by introducing a power supply voltage compensation circuit.

Further, taking a 27 inch Full High Definition (FHD)144Hz display panel as an example, the refresh range is between 48Hz and 144Hz, and the power consumption of the display panel is also increasing with the increase of the refresh rate, in this case, if the compensation circuit is set to select a fixed compensation value to compensate the power voltage AVDD (power supply of analog circuit in IC, and AVDD will be divided into 14 Gamma voltages), good compensation can only be achieved for the ripple of the fixed range of the supply voltage, which, when the refresh frequency increases, this fixed offset value then can't continue to realize carrying out accurate compensation function to the ripple of the mains voltage who has surpassed the compensation range, leads to along with the increase of refresh frequency, and the mains voltage ripple still can increase, and response time increases, if utilize this kind of mains voltage to supply power for display panel, then the smear phenomenon appears easily in display panel to and the problem such as far-end side demonstration blackblock.

Based on the problem, the inventor of the present invention further researches and discovers that a compensation circuit can be provided to select an appropriate compensation value to compensate the ripple of the power supply voltage according to the refresh frequency of the current display panel, so that even if the refresh frequency of the display panel changes, the ripple of the power supply voltage can be well reduced, and the ripple is prevented from affecting the display quality of the display panel.

Referring to fig. 1, an embodiment of the present invention provides a power supply voltage compensation method, applied to an integrated power management circuit, where the integrated power management circuit is applied to a display panel, the integrated power management circuit includes a plurality of compensation units, a power supply voltage output terminal, and a compensation circuit access terminal, and the power supply voltage compensation method includes:

step S101, periodically collecting a current signal of a power supply voltage output end, wherein the power supply voltage output end is electrically connected with a driving chip in a display panel;

step S102, determining compensation control information corresponding to the current signal from a preset lookup table according to the magnitude of the current signal; the lookup table comprises corresponding relations between different current signals and compensation control information;

step S103, controlling a corresponding target compensation unit in the plurality of compensation units to be accessed to the compensation circuit access end according to the compensation control information;

and step S104, periodically adjusting the power supply voltage output by the power supply voltage output end according to the target compensation unit.

Specifically, in step S101, a current signal corresponding to the power supply voltage output terminal may be sampled every interval period T to obtain the current signal; the length of the period T can be set according to actual needs. It should be noted that the power voltage output terminal may be electrically connected to a driving chip in the display panel, and is exemplarily electrically connected to a source driving chip in the display panel, and is configured to provide a power voltage for the source driving chip.

In the step S102, the preset lookup table records a corresponding relationship between different current signals and compensation control information; for each period T, automatically querying compensation control information corresponding to the current signal from a preset lookup table according to the magnitude of the current signal obtained in step S101, where the compensation control information represents information of a target compensation unit corresponding to the plurality of compensation units in the current signal.

In step S103, for each period T, according to the current compensation control information determined in step S102, the target compensation unit corresponding to the compensation unit is connected to the compensation circuit access terminal.

In the step S104, the power supply voltage output by the power supply voltage output terminal is compensated according to the target compensation unit currently connected to the compensation circuit connection terminal, corresponding to each period T.

In the power supply voltage compensation method provided by the embodiment of the invention, the current signal of the power supply voltage output end can be periodically acquired, and the corresponding target compensation unit is accessed to the compensation circuit access end according to the current signal, so that the power supply voltage output by the power supply voltage output end is periodically adjusted according to the target compensation unit; therefore, the power supply voltage compensation method provided by the embodiment of the invention can adaptively compensate according to the ripple conditions of the power supply voltage in different periods, so that the power supply voltage output by the integrated power supply management circuit in different periods has lower ripple, and thus when the power supply voltage is provided for a display product, the display product can realize good display quality.

Therefore, the power supply voltage compensation method provided by the embodiment of the invention can be used for adaptively compensating according to the ripple condition of the power supply voltage at different time intervals, developers do not need to debug the compensation circuit for many times, the workload of the developers is prevented from being increased, and the debugging time of the compensation circuit is saved, so that the project progress is better ensured.

In more detail, taking the vehicle-mounted display as an example, the current development trend of the vehicle-mounted display is that the resolution is larger and larger, the screen size is also larger and larger, and the RC Loading (load drop) is larger and larger, so the development trend of the driving direct current power supply (DCDC) in the vehicle-mounted display is an integrated PMIC, and the integrated PMIC can generate multiple voltages at the same time, such as: AVDD/VGH/VGL/2CHDVDD/VCOM/4CH Gamma and the like, and can adjust each path of voltage through a CODE (CODE), and the PMIC peripheral circuit is simple and convenient to operate. When the power supply voltage compensation method provided by the embodiment of the invention is applied to a 27FHD 144HZ display panel, PMIC RT6819 is taken as an example, as shown in fig. 2, and is a schematic diagram of RT6819, in the conventional compensation method, RC compensation of the voltage generating the power supply voltage AVDD needs to be debugged to an optimal value, and all modes and refresh rates of the product need to be applied, so that debugging is complex, time consumption is long, and various modes and refresh rates cannot be flexibly corresponded; when the power supply voltage compensation method provided by the embodiment of the invention is adopted, the adaptive compensation can be carried out according to the ripple conditions of the power supply voltage at different time periods, so that a long-time and complex debugging process is not needed, various modes and refresh rates can be flexibly corresponded, and the operation process is simple and convenient.

It should be noted that in fig. 2, AVDD is the power supply voltage output terminal, COMPA is the compensation circuit access terminal, and the compensation circuit 10 may include a resistor structure Rcomp and a capacitor structure Ccomp connected in series, where the compensation circuit 10 is actually located inside RT 6819.

Taking a 27 inch FHD144Hz display panel as an example, the refresh range is between 48Hz and 144Hz, the typical refresh rate is 120Hz, and when the display panel works at 144Hz, the load (loading) is large, and there are many problems in the development process, which are specifically described as follows:

the first problem is that: as shown in fig. 3, when the display panel 20 is first Enabled (EN) to output, Nova assembled Pixel Dot Gray80 picture (heavy Gray80 picture) is found to have horizontal black blocks (black blocks) 30 with a width of about 40 lines on the far end (DPO) side at high frequency (> 80Hz, such as 140Hz in fig. 11), and the reason for the black blocks is found by analysis: the response time of the power supply voltage compensation circuit is too long, so that the power supply voltage and Gamma are pulled abnormally when the heavy load mode frame is started, the data signal output (S-output) is abnormal, and finally the DPO side black Block is caused.

When the supply voltage compensation method provided by the embodiment of the invention is adopted for compensation, the current signal of the supply voltage output end is periodically collected, the corresponding target compensation unit (such as an RC series circuit, R takes a value of 220k, and C takes a value of 220pF) is connected to the compensation circuit access end according to the current signal, and the originally connected compensation unit (such as an RC series circuit, R takes a value of 51k, and C takes a value of 0.1nF) is disconnected from the compensation circuit access end, so that the supply voltage output by the supply voltage output end is adaptively compensated, the response time of the supply voltage compensation circuit is reduced, the phenomena that the supply voltage and Gamma are pulled abnormally when a heavy load mode frame is started and the data signal output (S-output) is abnormal are avoided, and the black Block in a display panel is eliminated.

In more detail, as shown in fig. 10 and 11, STV in fig. 10 and 11 represents a frame start signal, fig. 10 and 11 show schematic diagrams of corresponding signals in two display panels, wherein one display panel (defined as a first display panel) is a display panel compensated by using a fixed compensation voltage, the other display panel (defined as a second display panel) is a display panel compensated by using the compensation method provided by the embodiment of the present invention, and AVDD compensation voltage-NG corresponding to a solid line in fig. 10 represents a fixed power supply compensation voltage used in the first display panel, and it can be seen from fluctuation of the signals that the response time of the AVDD compensation circuit in the first display panel is long after a frame is turned on; the AVDD voltage-NG corresponding to the solid line in fig. 10 represents the compensated power voltage in the first display panel, and it can be seen that the power voltage of the first display panel is abnormally pulled down for 270 μ S and 2800mV after the frame is turned on, as shown in fig. 11, the data signal output S-output-NG corresponding to the first display panel is abnormally pulled down for 280mV and the pull-down time is 270 μ S, which results in horizontal black blocks of about 40 rows on the first display panel.

The AVDD compensation voltage-OK corresponding to the dotted line in fig. 10 represents the power compensation voltage corresponding to the compensation method provided by the embodiment of the present invention when the second display panel is compensated, and it can be seen from this signal that after the frame is turned on, the response time of the AVDD compensation circuit in the second display panel is short, and a suitable power compensation voltage can be rapidly provided; the AVDD voltage-OK corresponding to the dotted line in fig. 10 represents the compensated power supply voltage in the second display panel, and it can be seen that the power supply voltage of the second display panel is not pulled down substantially after the frame is turned on, as shown in fig. 11, the corresponding data signal output S-output-OK is not pulled down abnormally, and the horizontal black block in the second display panel is avoided.

The second problem is that: when the display panel is subjected to picture quality detection, the generated adverse phenomena are as follows: when Himax and Nova are matched, the excel window is dragged up and down by the 63-gray-scale desktop background, and the cross phenomenon occurs around the window, and the phenomenon is slight when the refresh frequency of the display panel is 60Hz and serious when the refresh frequency of the display panel is 144 Hz. For another example: as shown in fig. 4 and 5, in the normal mode, Gray255 is displayed in the middle of the display panel, a water blue image (corresponding to G127 and B127) is displayed in the peripheral portion of the display panel, and due to the influence of the power supply voltage ripple, two sides of the display panel may have smear (horizontal cross); it should be noted that such smear exists when the intermediate portion is not dragged, and becomes more noticeable when the intermediate portion is dragged.

When the poor investigation of the second problem is carried out, the following findings are found: when the refresh frequency of the display panel is 144Hz, the ripple voltage of the power supply voltage fluctuates up and down by 200mV, taking gama 5 and gama 10 as examples, the ripple voltage of gama 5 fluctuates up and down by 106mV, and the ripple voltage of gama 10 fluctuates up and down by 59mV, so that the ripple voltage of gama 5 and the ripple voltage of gama 10 fluctuate greatly.

The reason why the ripple voltage fluctuates up and down is analyzed as follows: the integrated Power Management circuit (PMIC) generates a Power voltage, and 14 paths of Gamma voltages generated by the Power voltage are provided to the display panel through 8 drivers (e.g., Gamma5 and Gamma10 are 63 gray scale voltages), so that the Gamma voltage ripples are directly influenced by the Power voltage ripples, and the Gamma voltage is unstable, the display brightness of the display panel is uneven, and a Crosstalk (Crosstalk) phenomenon is generated. Moreover, since the refresh frequency is from 60Hz to 144Hz, the load is larger and larger along with the increasing of the refresh frequency, and the ripple of the power supply voltage is larger, so that the GAMMA voltage ripple is larger, the refresh frequency of the display panel is slight when being 60Hz, and is serious when being 144 Hz; if Crosstalk decreases when the refresh frequency of the display panel is 144Hz, Crosstalk also decreases when the refresh frequency of the display panel is 60 Hz.

When the power supply voltage compensation method provided by the embodiment of the invention is adopted for compensation, the adaptive compensation of the power supply voltage output by the power supply voltage output end is realized and the Crosstalk at two sides of the display panel is eliminated by periodically collecting the current signal of the power supply voltage output end, accessing the corresponding target compensation unit (such as an RC series circuit, R value 220k and C value 220pF) to the compensation circuit access end according to the current signal and disconnecting the originally accessed compensation unit (such as the RC series circuit, R value 51k and C value 0.1nF) from the compensation circuit access end.

In more detail, when the power supply voltage compensation method provided by the embodiment of the invention is adopted for compensation, for example, the power supply voltage of 11.8V generated by PMIC is more stable, the corresponding ripple voltage is smaller, and when GAMMA5 and GAMMA10 are generated by using the power supply voltage, the pulling of GAMMA5 and GAMMA10 at the boundary of the excel window and the peripheral picture thereof is changed from 106mV and 59mV to 22mV and 12mV respectively, so that the Crosstalk phenomenon is obviously reduced. It should be noted that the term "pulling" as referred to herein may be interpreted as noise, interference, etc.

As shown in fig. 6, in some embodiments, the power supply voltage compensation method further includes:

step S100, before periodically collecting a current signal of a power supply voltage output end, judging whether the current signal of the power supply voltage output end is collected or not, and generating a corresponding judgment result;

step S105, when the judgment result indicates that the current signal of the power supply voltage output end is not collected, controlling a preset compensation unit in the plurality of compensation units to be connected to the compensation circuit access end;

and step S106, adjusting the power supply voltage output by the power supply voltage output end according to the preset compensation unit.

Specifically, the power supply voltage compensation method further includes: before step S101, determining whether a current signal of the power supply voltage output terminal needs to be acquired, and generating a corresponding determination result indicating that the current signal of the power supply voltage output terminal needs to be acquired or indicating that the current signal of the power supply voltage output terminal does not need to be acquired; for example, the judgment of whether the current signal at the power supply voltage output end needs to be collected includes: and judging whether the refresh frequency of the display panel changes or not, if so, indicating that the current signal of the power supply voltage output end needs to be acquired, and if not, indicating that the current signal of the power supply voltage output end does not need to be acquired.

In the step S105, when the determination result indicates that the current signal at the power supply voltage output end is not collected, a preset compensation unit of the plurality of compensation units may be controlled to access the compensation circuit access end; the preset compensation unit is a compensation unit capable of adapting to the current compensation requirement, and is connected to the compensation circuit access end, so that the ripple of the current power supply voltage can be well compensated.

In the step S106, when a preset compensation unit of the plurality of compensation units is connected to the compensation circuit connection end, the power supply voltage output by the power supply voltage output end may be adjusted according to the preset compensation unit, so as to realize good compensation for the ripple of the current power supply voltage.

It is worth noting that the preset compensation circuit can be connected to the compensation circuit connection end in advance, so that when the judgment result generated in the step S100 indicates that the current signal of the power supply voltage output end is not collected, the connection of the preset compensation circuit does not need to be controlled again.

In the power supply voltage compensation method provided by the above embodiment, a user may autonomously select to turn on or not turn on the function of collecting the current signal at the power supply voltage output terminal according to actual requirements, and if not, a preset compensation unit may be connected to the compensation circuit connection terminal, so as to compensate the power supply voltage output by the power supply voltage output terminal; if the starting is finished, the step S101 to the step S104 are carried out; therefore, the power supply voltage compensation method provided by the embodiment can compensate the power supply voltage according to actual needs, so that not only is resource waste avoided, but also the compensation efficiency is effectively improved.

As shown in fig. 7, in some embodiments, the power supply voltage compensation method further includes:

step S201, generating a first timing control signal and a second timing control signal which are periodic;

step S1011, periodically collecting a current signal at a power supply voltage output end according to the first timing control signal;

step S1041, under the control of the second timing control signal, periodically adjusting the power voltage output by the power voltage output terminal according to the target compensation unit.

Specifically, the manner of controlling the periodic collection of the current signal at the power supply voltage output end and the periodic adjustment of the power supply voltage output by the power supply voltage output end is various, and the exemplary power supply voltage compensation method further includes: step S201, generating a first timing control signal and a second timing control signal which are periodic; the period of the first timing control signal and the period of the second timing control signal can be set to be equal or unequal, the effective level time of the first timing control signal and the effective level time of the second timing control signal can be set to be overlapped or staggered, and when the effective level time of the first timing control signal and the effective level time of the second timing control signal are staggered, the effective level of the second timing control signal can be arranged behind the effective level of the first timing control signal, so that in one period, the current signal of the power supply voltage output end can be collected firstly under the effective level of the first timing control signal; and then in the period, under the effective level of a second time sequence control signal, the power supply voltage output by the power supply voltage output end is periodically adjusted according to the target compensation unit.

It is worth noting that the periods of the first timing control signal and the second timing control signal can be set according to actual needs, and for example, the periods of the first timing control signal and the second timing control signal can be set to be smaller, so as to realize real-time compensation of the power supply voltage.

In the power supply voltage compensation method provided in the above embodiment, the first timing control signal and the second timing control signal are set to respectively control the acquisition of the current signal and the adjustment of the power supply voltage, so that not only can the periodic compensation of the power supply voltage be realized, but also the real-time compensation can be realized by adjusting the period.

It should be noted that the periodic first timing control signal and the periodic second timing control signal may be generated by the power supply voltage compensation circuit, or in some application scenarios, if there is a suitable timing control signal, the timing control signal in the scenario may also be multiplexed.

In some embodiments, the plurality of compensation units comprises: the first main branch switch, the second main branch switch, the first branch switch, the second branch switch, the third branch switch, the fourth branch switch, the first compensation unit, the second compensation unit, the third compensation unit and the fourth compensation unit;

Specifically, as shown in fig. 8, the compensation circuit access terminals are respectively coupled to a first terminal of the first main switch D0 and a first terminal of the second main switch D0 Bar, a second terminal of the first main switch D0 is respectively coupled to a first terminal of the first branch switch D1 and a first terminal of the second branch switch D1 Bar, a second terminal of the first branch switch D1 is coupled to the first compensation unit 11, and a second terminal of the second branch switch D1 Bar is coupled to the second compensation unit 12; a second terminal of the second main switch D0 Bar is coupled to a first terminal of the third branch switch D1 'and a first terminal of the fourth branch switch D1' Bar, respectively, a second terminal of the third branch switch D1 'is coupled to the third compensation unit 13, and a second terminal of the fourth branch switch D1' Bar is coupled to the fourth compensation unit 14.

The first main switch, the second main switch, the first branch switch, the second branch switch, the third branch switch and the fourth branch switch can be switched on and off by code control, illustratively, the first main switch and the second main switch are mutually in opposite phase, namely, when the first main switch is switched on, the second main switch is switched off, and when the first main switch is switched off, the second main switch is switched on; the first branch switch and the second branch switch are opposite in phase, namely when the first branch switch is switched on, the second branch switch is switched off, and when the first branch switch is switched off, the second branch switch is switched on; the third branch switch and the fourth branch switch are opposite in phase, that is, when the third branch switch is switched on, the fourth branch switch is switched off, and when the third branch switch is switched off, the fourth branch switch is switched on; the first branch switch and the third branch switch are in phase, that is, the first branch switch and the second branch switch are simultaneously turned on or turned off.

For example, as shown in table 1, the lookup table may include three sets of correspondences between the current signals and the compensation control information, where the first set of correspondences is: the current signal is between Imin and Imin +1/3(Imax and Imin), and a first compensation unit (such as R1C1) is correspondingly connected to the compensation circuit access end; the second set of corresponding relationships is: the current signal is between Imin +1/3(Imax-Imin) and Imin +2/3(Imax-Imin), and a second compensation unit (such as R2C2) is correspondingly connected to the compensation circuit access end; the third set of corresponding relationships is: the current signal is between Imin +2/3(Imax-Imin) -Imax, and a third compensation unit (such as R3C3) is correspondingly connected to the compensation circuit access end; in each set of correspondences, the range of the current signal may include a left end value or may include a right end value.

It should be noted that table 1 also shows a fourth set of corresponding relationships, and when the current signal is not collected, that is, the current signal is a preset value (Default), the fourth compensation unit (for example, R4C4) may be connected to the compensation circuit access terminal as the preset compensation unit.

TABLE 1

When the plurality of compensation units include: when the first main switch, the second main switch, the first branch switch, the second branch switch, the third branch switch, the fourth branch switch, the first compensation unit, the second compensation unit, the third compensation unit, and the fourth compensation unit are provided, for example, the power supply voltage compensation method provided in the above embodiment specifically includes: the PMIC samples current of a power supply voltage output end (AVDD) at intervals of time T, compares current signals obtained by AVDD sampling with a table 1, determines a target compensation unit accessed to the compensation circuit access end, and controls a main circuit switch and a branch circuit switch corresponding to the target compensation unit to be switched on through codes so as to access the target compensation unit to the compensation circuit access end.

For example, as shown in table 2, the PMIC samples the current of the AVDD at the time T of startup, and the current of the sampling result is in the interval Imin-Imin +1/3(Imax-Imin), at this time, the AVDD compensation function register CODE of the PMIC is automatically adjusted to 11 (corresponding to D0D1), the AVDD compensation circuit selects the AVDD compensation resistor as R1 and the AVDD compensation capacitor as C1 through two switches D0 and D1, that is, the compensation unit corresponding to R1C1 is the current target compensation unit, and the remaining compensation units are all non-target compensation units; if the AVDD compensation function is selected not to be started, PMIC CODE is changed to 00 (corresponding to D0D1), the AVDD compensation resistor is the default R4, and the AVDD compensation capacitor is also the default C4.

TABLE 2

It can be seen that, when the power supply voltage compensation method provided by the above embodiment is used for compensating the power supply voltage, if the AVDD compensation function is selected to be turned on, the PMIC may select the most appropriate target compensation circuit to access the compensation circuit access end in real time along with the increase or decrease of power consumption, and if the AVDD compensation function is not selected to be turned on, the preset compensation circuit is selected to access the compensation circuit access end, thereby implementing a good compensation function for the power supply voltage.

As shown in fig. 9, an embodiment of the present invention further provides a power supply voltage compensation circuit, for implementing the power supply voltage compensation method provided in the foregoing embodiment, where the power supply voltage compensation circuit is applied to an integrated power management circuit, the integrated power management circuit is applied to a display panel, the integrated power management circuit includes a plurality of compensation units, a power supply voltage output terminal, and a compensation circuit input terminal, and the power supply voltage compensation circuit includes:

the current sampling module 50 is used for periodically collecting a current signal at a power supply voltage output end, and the power supply voltage output end is electrically connected with a driving chip in the display panel;

the lookup module 60 is configured to determine, according to the magnitude of the current signal, compensation control information corresponding to the current signal from a preset lookup table; the lookup table comprises corresponding relations between different current signals and compensation control information;

the compensation control module 70 is configured to control, according to the compensation control information, a corresponding target compensation unit in the plurality of compensation units to access the compensation circuit access end;

and a voltage adjusting module 80, configured to periodically adjust the power supply voltage output by the power supply voltage output end according to the target compensation unit.

Specifically, the current sampling module 50 may sample a current signal corresponding to the power supply voltage output end every interval period T to obtain the current signal; the length of the period T can be set according to actual needs.

Recording the corresponding relation between different current signals and compensation control information in the preset lookup table; for each period T, the search module 60 automatically searches compensation control information corresponding to the current signal from a preset search table according to the magnitude of the obtained current signal, where the compensation control information represents information of a target compensation unit corresponding to the plurality of compensation units in the current signal.

For each period T, the compensation control module 70 accesses the corresponding target compensation unit of the plurality of compensation units to the compensation circuit access end according to the current compensation control information determined by the search module 60.

For each period T, the voltage adjustment module 80 compensates the power voltage output by the power voltage output terminal according to the target compensation unit currently accessed to the compensation circuit access terminal. It should be noted that the specific types of the voltage adjustment module 80 are various, and for example, the voltage adjustment module 80 includes a Boost voltage adjustment module 80 (e.g., an AVDD Boost module, which is capable of inputting a VCC voltage and outputting an AVDD voltage) and/or a buck voltage adjustment module 80, but is not limited thereto.

The power supply voltage compensation circuit provided by the embodiment of the invention can periodically collect the current signal of the power supply voltage output end and access the corresponding target compensation unit to the compensation circuit access end according to the current signal, so that the power supply voltage output by the power supply voltage output end is periodically adjusted according to the target compensation unit; therefore, the power supply voltage compensation circuit provided by the embodiment of the invention can adaptively compensate according to the ripple conditions of the power supply voltage in different periods, so that the power supply voltage output by the integrated power supply management circuit in different periods has lower ripple, and thus when the power supply voltage is provided for a display product, the display product can realize good display quality.

In some embodiments, the supply voltage compensation circuit comprises:

the compensation control module 70 is further configured to control a preset compensation unit of the plurality of compensation units to access the compensation circuit access end when the determination result indicates that the current signal at the power supply voltage output end is not acquired;

the voltage adjusting module 80 is further configured to adjust the power voltage output by the power voltage output end according to the preset compensation unit.

Specifically, before step S101, the compensation determining module determines whether the current signal of the power supply voltage output end needs to be acquired, and generates a corresponding determining result indicating that the current signal of the power supply voltage output end needs to be acquired or indicating that the current signal of the power supply voltage output end does not need to be acquired; for example, the judgment of whether the current signal at the power supply voltage output end needs to be collected includes: and judging whether the refresh frequency of the display panel changes or not, if so, indicating that the current signal of the power supply voltage output end needs to be acquired, and if not, indicating that the current signal of the power supply voltage output end does not need to be acquired.

When the judgment result indicates that the current signal at the power supply voltage output end is not collected, the compensation control module 70 may control a preset compensation unit of the plurality of compensation units to be connected to the compensation circuit access end; the preset compensation unit is a compensation unit capable of adapting to the current compensation requirement, and is connected to the compensation circuit access end, so that the ripple of the current power supply voltage can be well compensated.

When a preset compensation unit of the plurality of compensation units is connected to the compensation circuit connection end, the voltage adjustment module 80 may adjust the power voltage output by the power voltage output end according to the preset compensation unit, so as to realize good compensation for the ripple of the current power voltage.

It is worth noting that the preset compensation circuit can be connected to the compensation circuit connection end in advance, so that when the judgment result indicates that the current signal of the power supply voltage output end is not collected, the connection of the preset compensation circuit does not need to be controlled again.

In the power supply voltage compensation circuit provided by the above embodiment, a user can autonomously select to turn on or not turn on the function of collecting the current signal at the power supply voltage output end according to actual requirements, and if the function is not turned on, a preset compensation unit can be connected to the compensation circuit access end, so that compensation of the power supply voltage output by the power supply voltage output end is realized; if the starting is finished, the step S101 to the step S104 are carried out; therefore, the power supply voltage compensation circuit provided by the embodiment can compensate the power supply voltage according to actual needs, so that resource waste is avoided, and the compensation efficiency is effectively improved.

In some embodiments, the supply voltage compensation circuit further comprises:

a timing control module 40 for generating a first timing control signal and a second timing control signal which are periodic;

the current sampling module 50 is specifically configured to periodically collect a current signal at the power supply voltage output end according to the first timing control signal;

the voltage adjusting module 80 is specifically configured to periodically adjust the power supply voltage output by the power supply voltage output end according to the target compensation unit under the control of the second timing control signal.

Specifically, the timing control module 40 may be the timing control module 40 integrated with the power management circuit, but is not limited thereto.

In operation, the timing control module 40 generates a first timing control signal and a second timing control signal that are periodic; the period of the first timing control signal and the period of the second timing control signal can be set to be equal or unequal, the effective level time of the first timing control signal and the effective level time of the second timing control signal can be set to be overlapped or staggered, and when the effective level time of the first timing control signal and the effective level time of the second timing control signal are staggered, the effective level of the second timing control signal can be arranged behind the effective level of the first timing control signal, so that in one period, the current signal of the power supply voltage output end can be collected firstly under the effective level of the first timing control signal; and then in the period, under the effective level of a second time sequence control signal, the power supply voltage output by the power supply voltage output end is periodically adjusted according to the target compensation unit.

In the power supply voltage compensation circuit provided in the above embodiment, the first timing control signal and the second timing control signal are set to respectively control the acquisition of the current signal and the adjustment of the power supply voltage, so that not only can the periodic compensation of the power supply voltage be realized, but also the real-time compensation can be realized by adjusting the period.

It should be noted that the functions of the modules included in the power supply voltage compensation circuit may be implemented by a processor.

the compensation control module 70 is specifically configured to control, according to the compensation control information, a target main switch and a target branch switch, which are sequentially coupled to target compensation units in the first compensation unit, the second compensation unit, the third compensation unit, and the fourth compensation unit, to be closed, and control a non-target main switch and a non-target branch switch to be opened.

When the power supply voltage compensation circuit provided by the embodiment is adopted to compensate the power supply voltage, if the AVDD compensation function is selected to be started, the most appropriate target compensation circuit can be selected to be accessed to the compensation circuit access end along with the increase or decrease of the power consumption in real time, and if the AVDD compensation function is not selected to be started, the preset compensation circuit is selected to be accessed to the compensation circuit access end, so that the compensation function for the power supply voltage is good.

In some embodiments, each of the compensation units includes a resistor structure and a capacitor structure connected in series, and the resistance values of the resistor structures included in different compensation units are different and/or the capacitance values of the capacitor structures included in different compensation units are different.

Specifically, a resistance value of the resistor structure and a capacitance value of the capacitor structure included in each compensation unit may be set according to actual needs, for example, the resistance values of the resistor structures included in different compensation units are different, and/or the capacitance values of the capacitor structures included in different compensation units are different; further, the resistance value of the resistor structure in the predetermined compensation unit may be set to 51k, the capacitance value may be set to 1nF, the resistance value of the resistor structure in the first compensation unit may be set to 220k, and the capacitance value of the capacitor structure may be set to 220pF, but is not limited thereto.

The embodiment of the invention also provides an integrated power management circuit which comprises the power supply voltage compensation circuit provided by the embodiment.

The power supply voltage compensation circuit provided by the embodiment can periodically collect the current signal of the power supply voltage output end, and access the corresponding target compensation unit to the compensation circuit access end according to the current signal, so that the power supply voltage output by the power supply voltage output end is periodically adjusted according to the target compensation unit; therefore, the power supply voltage compensation circuit provided by the embodiment can adaptively compensate according to the ripple conditions of the power supply voltage in different periods, so that when the integrated power supply management circuit provided by the embodiment of the invention comprises the power supply voltage compensation circuit, the power supply voltage output by the integrated power supply management circuit in different periods has lower ripple, and thus when the power supply voltage is provided for a display product, the display product can realize good display quality.

The embodiment of the invention also provides a display device which comprises the integrated power management circuit provided by the embodiment.

Because the integrated power management circuit provided by the embodiment has lower ripples on the output power voltages in different periods, the display device provided by the embodiment of the invention can eliminate the black Block in the display panel and eliminate the cross on two sides of the display panel when the display device comprises the integrated power management circuit provided by the embodiment, so that the display device can realize good display quality.

The display device may be: the display device comprises a television, a display, a digital photo frame, a mobile phone, a tablet personal computer and any other product or component with a display function, wherein the display device further comprises a flexible circuit board, a printed circuit board, a back plate and the like.

The embodiment of the present invention further provides a power supply voltage compensation circuit, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the power supply voltage compensation method provided in the above embodiment are implemented.

Specifically, the power supply voltage compensation method realizes the following steps when being executed by a processor:

step S101, periodically collecting a current signal at a power supply voltage output end;

step S102, according to the current signal, determining compensation control information corresponding to the current signal from a preset lookup table; the lookup table comprises corresponding relations between different current signals and compensation control information;

Optionally, when executed by the processor, the power supply voltage compensation method may further implement the following steps:

The power supply voltage compensation circuit can realize each process of the power supply voltage compensation method embodiment, can achieve the same technical effect, and is not repeated here to avoid repetition.

It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method embodiments, since they are substantially similar to the product embodiments, they are described simply, and reference may be made to the partial description of the product embodiments for relevant points.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected," "coupled," or "connected," and the like, are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A power supply voltage compensation method is applied to an integrated power supply management circuit, the integrated power supply management circuit is applied to a display panel, the integrated power supply management circuit comprises a plurality of compensation units, a power supply voltage output end and a compensation circuit access end, and the power supply voltage compensation method comprises the following steps:

according to the target compensation unit, periodically adjusting the power supply voltage output by the power supply voltage output end;

the power supply voltage compensation method further includes:

2. The power supply voltage compensation method according to claim 1, wherein the step of determining whether to collect the current signal at the power supply voltage output terminal and generate the corresponding determination result specifically comprises:

3. The supply voltage compensation method of claim 1, further comprising:

generating a first and a second periodic timing control signal;

4. The supply voltage compensation method of claim 1, wherein the plurality of compensation units comprise: the first main branch switch, the second main branch switch, the first branch switch, the second branch switch, the third branch switch, the fourth branch switch, the first compensation unit, the second compensation unit, the third compensation unit and the fourth compensation unit;

5. The utility model provides a supply voltage compensating circuit, characterized in that is applied to integrated power management circuit, integrated power management circuit is applied to display panel, integrated power management circuit includes a plurality of compensation unit, supply voltage output and compensation circuit incoming end, supply voltage compensating circuit includes:

the voltage adjusting module is used for periodically adjusting the power supply voltage output by the power supply voltage output end according to the target compensation unit;

the power supply voltage compensation circuit includes:

6. The supply voltage compensation circuit of claim 5, wherein the compensation determining module is specifically configured to:

7. The supply voltage compensation circuit of claim 5, further comprising:

8. The supply voltage compensation circuit of claim 5, wherein the plurality of compensation units comprise: the first main branch switch, the second main branch switch, the first branch switch, the second branch switch, the third branch switch, the fourth branch switch, the first compensation unit, the second compensation unit, the third compensation unit and the fourth compensation unit;

9. The supply voltage compensation circuit according to claim 5, wherein each of the compensation units comprises a resistor structure and a capacitor structure connected in series, and a resistance value of the resistor structure included in different compensation units is different and/or a capacitance value of the capacitor structure included in different compensation units is different.

10. An integrated power management circuit comprising a supply voltage compensation circuit as claimed in any one of claims 5 to 9.

11. A display device comprising the integrated power management circuit of claim 10.

12. A supply voltage compensation circuit comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the supply voltage compensation method according to any of claims 1-4 when executing the computer program.